This is really impressive! It looks fantastic and the puzzles are cleverly done. Particularly like bouncing off the orange box in the reflection. I'm actually not sure how you achieved some of the things you did, which is even better!
As others have said, the wall slide thing gets in the way of what otherwise feels like a really smooth platformer, but I'm sure that would be a simple enough fix with a little more time.
Other than that, top marks, this is a really great entry!