Good job, I enjoyed that one. The mechanic is sometimes hard to get right (wall jumping), but overall it works really well. I like the moment when the first level came where you have to "go around", made me chuckle. Also one of the later levels felt very Portal like. It seems falling speed is not reset when you die, so because I let the character drop for a long time I had trouble then to get solid ground beneath it.
I'm glad you spent the time you had making 10 levels instead of introducing new mechanics, the design work well and teaches everything you need to know! The music is not my most favourite one, though it suits the game's style. But the sound effects I do like.