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Games like Yal's FlappyEngine

General-purpose platform engine with many features, easy to extend.
Simple NPC/menu engine, easier to use than YaruMenuEngine but less powerful.
Path-based racing game engine.
Inertia-based platformer engine. Gotta go fast!
A simple Tactics engine for GM:Studio
A FPS engine with 3D collision checking and seamless room linking!
Generates complex dungeons built using room-cell 'blueprints'. Format: GameMaker Studio.
Simple & powerful engine for bullet hell / shmup games
A pixel art environment tileset containing 7 different themes.
GIF
170 tiles, 6 premade skins, unlimited colors.
10,000+ more game assets for use in your games!
GIF
Skeletal animation system for GameMaker:Studio
112 tilesets for a variety of biomes.
Simple IK approach for custom ragdolls or skeleton animation.
Simple and fast 3D collisions for GameMaker:Studio
Lowpoly 3D platformer toolkit for GameMaker:Studio
Buttons, windows, item slots - fully generic and extensible!
A simple effect to draw fake-3D rooms, easy to import into your project!
GIF
Cute 2D animals sprites
Tools and Game Assets for big fighting videogames very cheap and good quality