DON'T PLAY IN FULLSCREEN! To fix collisions upon fullscreening, reload the page. Left and Right / A and D to move. Up / W to jump. Moon gravity is key, once you bump your head off the ceiling you fall back down, if not, you float into the abyss. Don't fall down pits!
Used BeepBox for some tunes, code is pretty much done by me. Obviously Goombers are inspired by the Goomba from Super Mario. I didn't create those originally. Flash 8 was used for the opening cutscene and Wick Editor was used for the closing. All art besides that is done in Scratch itself.