I enjoyed the game until I could proceed no further. I dont usually play the hard games, so lets not talk about that. I am sure there are players who would love these level designs.
One problem with control was that arrow button got me really confused, I would switch arrow button instead of a/d to move mid air. I rage quit there.
I really loved the portal concept, art and music. I also think all the levels that I could complete were well designed. I wish I could get more power ups so I could be more precise in this comment.
All in all this is really good game and I hope you continue with this.