Interesting idea! Got stuck on the wall on level 4 though, gonna wanna fix that. Also the appeal sort of wears off after 5 or 6 levels. There's not really much to do except for play around with controls until you figure them out enough to jump through holes and glide through walls. Perhaps make some more exciting graphics too. I understand if you're bad at drawing, I am too. All I'm saying is right now your 'cube' is a square, you could maybe add some shade to it. A quick mid green down the left, and a slightly darker green line on the bottom would do the trick. Also some particles could be fun. Also you might wanna make sure your music isn't copyrighted.
TL;DR
- Interesting idea
- New features / puzzles
- Stuck on level 4
- Shade the 'cube' and make graphics more exciting
- Copyrighted music (search royalty free music)
- More levels too!
Have a nice day! :)