This is a fun game. The levels are well designed and made good use of the mechanics. The animation are pretty cool.
I think that the collider for the player should be a square so that it won't touch the bush close by and die when rotating. There's a bug in the first portal level where bushes on the left edge of the screen is not killing the player. I'm not sure if it's only me, but the music can sometimes 'breaks' and produce a pop sound.
The game feels very polished. Great job on it!