Howdy ~
I had a lot of fun with the mechanics, bouncing between the walls was a really fresh take on classic platformer mechanics.
I think that in some of the parts (especially when the free area is only two squares tall) precise movement was more frustrating than challenging because I was never 100% sure how high I would bounce. Sometimes I bounced very little and othertimes I felt like I would bounce a lot and die as a result.
I thought the game produced at the end was super fun and solid. I think you did a fantastic job :)