Use left and right arrow keys to move horizontally. Use spacebar to jump. Press it twice or hold it to double jump. You can make a scrolling platformer off of this engine, but you have to add the level end, title screen, and game over screen, along with animations, and code for all of these.
Code: @CreatorLikeMaster - CharacterController, Level Design: @CreatorLikeMaster - CharacterController @CreatorLikeMaster - Level