Portal is one of my favorite games, this is like portal but 2.5D and minimalistic! You made a very nice game and borrowed some of the best elements from your inspiration: good art, good gameplay and a pretty good soundtrack to boot!
The only criticism I have is that glass kills you if you don't have enough speed, maybe you should be allowed to walk on the glass in these cases? Also maybe you should have done something more with holes, like involving wormholes /blackholes or something else.
Overall a very cool submission!