Thanks! I'm sorry that only 2 levels worked for you, I'm still working on optimization so I might have a new demo out later on.
It's cool that you would like to contribute to my game! The only things I need help with is better music for some of the levels, maybe some extra enemy designs, but I'm almost finished with most of the game. I'm doing the best I can to make a game like SPM, but it's not going to surpass it or anything since I can only do so much.
I'm also thinking of making some kind of sequel that's less of a precision platformer with more creative worlds, not sure yet though. If you have any areas you would like to help with let me know :)