Congrats on your first game in Godot ! Like the first comment said, I also didn't notice you only used 4 colors. Really cool trick with the checkerboard pattern ! If I may suggest something, I think the hints for the secret warp could point to a more specific hole in the level. It could make the game more interesting instead of having to try each hole one by one. Still, it's only a minor thing and finding secret warps back then definitely required a lot of trial and error. Overall really good job !