I really liked the concept of this one. A few things that came to mind as I was playing:
I often mixed up which abilities belonged to which color. Especially yellow and green which both use the trajectory line. I think some shape indication would make it easier to tell them apart.
When I was blue I expected it to hug the wall automatically when you move off the edge, but that doesn't seem to be the case.
I didn't really notice the different colors hurting me. A more obvious reaction in the graphics would help.