2D Platformer - Enemies, Hazards, Juice, Progression (Make game skill)

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Patrol enemy

extends CharacterBody2D
@export var speed: float = 60.0
var dir: float = 1.0
var gravity: float = ProjectSettings.get_setting("physics/2d/default_gravity")
@onready var ledge: RayCast2D = $LedgeCheck   # points down, ahead of feet

func _physics_process(delta: float) -> void:
	if not is_on_floor():
		velocity.y += gravity * delta
	if is_on_wall() or (is_on_floor() and not ledge.is_colliding()):
		dir *= -1.0
		ledge.position.x *= -1.0
		$Sprite2D.flip_h = dir < 0.0
	velocity.x = dir * speed
	move_and_slide()

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Stomp-to-kill

# in player, StompArea (Area2D) child
func _on_stomp_body_entered(enemy: Node) -> void:
	if velocity.y > 0.0 and enemy.has_method("die"):
		enemy.die()
		velocity.y = jump_velocity * 0.7   # bounce

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Hazards

• Spikes/lava: an Area2D on the Triggers layer that calls player.die().
• Bounce pad: Area2D that sets player.velocity.y = -launch_force on enter.
• Bottomless pit: one wide killzone under the level.

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Juice (the difference between prototype and game)

• Hit flash: modulate to white, tween back over 0.06s.
• Screen shake: offset the Camera2D by decaying random noise for ~0.2s.
• Hitstop: Engine.time_scale = 0.05 for one frame on a kill, then back to 1.0.
• Floating text: spawn a Label that rises and fades on coin/hit.
• Squash/stretch: tween the sprite scale to (1.2, 0.8) on land, back over 0.1s.
• Dust particles on land and on turn.

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Progression: coins, gems, and a level goal

• Coins increment GameManager.score; emit score_changed for the HUD.
• A level_end Area2D (flag/door) triggers the level-complete screen with time and coin count, then advances to the next room .tscn.
• Save unlocked rooms + best times via the save-load skill.

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Metroidvania gating (optional)

• AbilityManager autoload: unlocked: Dictionary, has(name), unlock(name).
• Ability pickup: Area2D that calls AbilityManager.unlock("double_jump").
• Ability gate: a wall/door that only opens if AbilityManager.has("dash"), or a ledge only reachable with double jump.
• The player controller checks AbilityManager.has("double_jump") before allowing a second air jump, has("dash") before a dash, etc.

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Traps

• Enemies as RigidBody2D fight the player physically; use CharacterBody2D or Area2D.
• Stomp check without a velocity.y > 0 guard kills enemies on any touch.
• Ledge raycast that does not flip with direction walks enemies off cliffs.
• Piling on juice at once (shake + hitstop + flash on every coin) reads as noise; reserve the big feedback for kills and damage, keep coins light.