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Overview

Steam is the largest PC gaming platform with 120+ million active users. This guide walks you through uploading your Summer Engine game to Steam. Prerequisites:
  • Exported game builds for your target platforms (macOS, Windows)
  • Steamworks developer account
  • $100 Steam Direct fee (one-time per game)

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Before You Begin: Steamworks Setup

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1. Create Steam Partner Account

1

Sign Up

Visit Steamworks and create an account
2

Complete Tax Forms

Required by Valve for revenue distribution (W-8/W-9 forms)
3

Pay Steam Direct Fee

100pergame(one−time,recoupedafter100 per game (one-time, recouped after 1,000 in sales)
4

Create App

Click Create New App in Steamworks dashboardFill in basic info (game name, description, genre)
The Steam Direct fee is refundable after your game makes $1,000 in sales. It’s Valve’s anti-spam measure.

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2. Configure Your Steam Store Page

Before uploading builds, set up your store page:
  • Game description (short and long)
  • Screenshots (at least 5)
  • Trailer video (highly recommended)
  • Pricing and release date
  • Supported languages
  • System requirements
You can do this while developing - store pages can be “Coming Soon” for wishlists.

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Uploading Your Game to Steam

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Understanding Steam Depots

Steam uses “depots” for different platform builds:
  • Windows Depot - Your MyGame.exe build
  • macOS Depot - Your MyGame.app build
  • Linux Depot - Your MyGame.x86_64 build
Each depot is uploaded separately but players download the right one automatically.

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Upload Process

1

Install Steamworks SDK

Download from Steamworks SDK pageExtract to a convenient location (e.g., ~/SteamworksSDK/)
2

Configure Build Scripts

Navigate to SteamworksSDK/tools/ContentBuilder/scripts/Edit app_build_<appid>.vdf:
"appbuild"
{
  "appid" "YOUR_STEAM_APP_ID"
  "desc" "v1.0.0 Release"
  "buildoutput" "../output/"
  "contentroot" "../../content/"
  "setlive" "default"
  
  "depots"
  {
    "WINDOWS_DEPOT_ID" "scripts/depot_build_windows.vdf"
    "MAC_DEPOT_ID" "scripts/depot_build_mac.vdf"
  }
}
3

Configure Depot Scripts

Edit depot_build_windows.vdf:
"DepotBuildConfig"
{
  "DepotID" "YOUR_WINDOWS_DEPOT_ID"
  "ContentRoot" "C:\path\to\your\exported\windows\build\"
  "FileMapping"
  {
    "LocalPath" "*"
    "DepotPath" "."
    "recursive" "1"
  }
}
Repeat for Mac depot pointing to your MyGame.app
4

Upload Build

Run the upload tool:
# Windows
steamcmd +login YOUR_STEAM_USERNAME +run_app_build ../scripts/app_build_<appid>.vdf +quit

# macOS
./steamcmd.sh +login YOUR_STEAM_USERNAME +run_app_build ../scripts/app_build_<appid>.vdf +quit
Enter your Steam password when prompted.
5

Verify Upload

Check Steamworks dashboard → Builds tabYou should see your uploaded build with all depots listed.
6

Set Build Live

In Steamworks: Builds → Set Build Live on BranchSelect default branch for public release, or beta for testing.
Test your Steam build before setting it live! Use the beta branch first, download through Steam, and verify everything works.

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Steam Features Integration (Optional)

Summer Engine supports Steamworks integration for advanced features:

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GodotSteam Plugin

GodotSteam is a community plugin that adds:
  • ✅ Achievements
  • ✅ Leaderboards
  • ✅ Steam Cloud saves
  • ✅ Steam Input (controller support)
  • ✅ Steam Overlay
  • ✅ Multiplayer matchmaking
How to add:
  1. Download GodotSteam from godotsteam.com
  2. Extract to your project’s addons/ folder
  3. Enable in Project → Project Settings → Plugins
  4. Follow GodotSteam docs for achievement/leaderboard setup
GodotSteam works identically in Summer Engine - all Godot Steam tutorials apply directly.

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Platform-Specific Configuration

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Windows Build Settings

Binary Format → Embed PCK: ✅ On
  • Creates single .exe file (easier for Steam)
  • Slightly slower loading than separate .pck (negligible for most games)
Debug → Export Console Wrapper:
  • Debug Only - For testing (console window shows debug output)
  • No - For final release (no console window)
Application → Product Name: Your game’s name as shown in Task Manager

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macOS Build Settings

Binary Format → Architecture: universal ✅
  • Supports both Intel and Apple Silicon Macs
  • Slightly larger file size but maximum compatibility
Application → Bundle Identifier: Set your unique ID (e.g., com.yourstudio.yourgame)
Use the same bundle identifier across all your game versions (Mac, iOS if applicable). This is important for cloud save continuity.

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Linux Build (Steam Deck)

Binary Format → Architecture: x86_64
  • Steam Deck uses this architecture
  • Export → Texture Format: Use S3TC BPTC (same as Windows)
Steam Deck Optimization:
  • Test UI at 1280x800 resolution (Steam Deck native)
  • Support controllers (Steam Input handles this)
  • Optimize for ~3-4 hours battery life

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Launch Options in Steamworks

After uploading, configure launch options in Steamworks:

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Windows Launch Options

Executable: MyGame.exe
Working Dir: (leave blank)
Arguments: (leave blank unless needed)

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macOS Launch Options

Executable: MyGame.app/Contents/MacOS/MyGame
Working Dir: (leave blank)
Arguments: (leave blank)
macOS launch path must point inside the .app bundle to the actual executable, not just the .app itself!

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Linux Launch Options

Executable: MyGame.x86_64
Working Dir: (leave blank)
Arguments: (leave blank)

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Testing Your Steam Build

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Use Steam Beta Branch

Before releasing publicly, test with beta builds:
1

Upload to Beta Branch

In Steamworks: Set your build live on beta branch (not default)
2

Access Beta

In Steam client:
  • Right-click your game → Properties
  • Betas tab → Select beta branch
  • Steam downloads your beta build
3

Test Everything

  • Launch the game through Steam
  • Test achievements (if using GodotSteam)
  • Verify cloud saves work
  • Test Steam Overlay (Shift+Tab)
  • Check controller support
4

Fix Issues and Re-upload

If you find bugs, fix in Summer Engine, re-export, and upload again to beta branch

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Final Release Checklist

Before setting your build live on default branch:
  • Tested on Windows 10 and Windows 11
  • Tested on macOS (if shipping Mac build)
  • All graphics render correctly
  • Audio plays without issues
  • Controllers work (if game supports them)
  • Achievements unlock properly (if applicable)
  • Cloud saves persist (if using Steam Cloud)
  • Game can be quit properly (doesn’t hang)
  • No console window in release build (Windows)
  • Store page complete (description, screenshots, trailer)

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Release Strategies

  1. Upload to beta branch - test with friends/testers
  2. Set “Coming Soon” on store page - build wishlists
  3. Release to default branch when ready - notify wishlist users
  4. Gather feedback - update game based on player response

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Immediate Release

  1. Upload build directly to default branch
  2. Publish store page immediately
  3. Announce on social media - drive traffic to Steam page

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Early Access

  1. Mark as Early Access in Steamworks
  2. Set clear roadmap - tell players what’s coming
  3. Update regularly - maintain player engagement
  4. Graduate to full release when feature-complete

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Updating Your Game on Steam

Players love games that get updates! Here’s how:
1

Fix/Add Features in Summer

Make changes to your game, test in editor
2

Re-Export

Export fresh builds for all platforms
3

Upload New Build

Use same ContentBuilder process with new build filesUpdate the desc field to version number (e.g., “v1.1.0 - Bug fixes”)
4

Set Live

Set new build live on default branchSteam automatically pushes update to all players!
Best practices:
  • Include patch notes in Steamworks (players see what’s new)
  • Test updates on beta branch first
  • Don’t push broken builds to default - use beta testing!

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Common Steam Issues

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Build Won’t Upload

Error: “Invalid content root” or “Files not found” Solution: Check that ContentRoot in your depot scripts points to the exact location of your exported build.

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Players Can’t Download Build

Cause: No build set live on default branch, or wrong platform depot Solution:
  • Verify build is set live in Steamworks → Builds
  • Check that Windows depot has Windows build, Mac depot has Mac build

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Achievement Not Unlocking

Cause: Achievement wasn’t configured in Steamworks, or GodotSteam integration issue Solution:
  • Configure achievements in Steamworks first
  • Use GodotSteam’s achievement test functions
  • Check Steam overlay is enabled

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Steam Distribution Fees

Revenue Split:
  • Steam takes 30% of all sales
  • You receive 70% of revenue
Example:
  • Game price: $20
  • Player buys game: $20 to Steam
  • You receive: $14 (after 30% cut)
  • After recouping $100 Steam Direct fee: All profit is yours
Payment Schedule: Monthly via direct deposit or wire transfer

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Next Steps

Publish to itch.io Too

Cross-platform indie game hosting (no revenue share!)

Add More Platforms

Export for Linux, mobile, or web

Troubleshooting

Common Steam upload and export issues

Marketing Your Game

External resource - learn Steam marketing
Pro tip: Release on both Steam and itch.io. Different audiences, both valuable. itch.io players are supportive of indie devs and give great feedback!
Need help with Steam? Discord • X/Twitter @SummerEngineCom • [email protected]