• Great work!
• Your core mechanic is really fun! 
• I think it works well, not over-explaining the mechanics and letting the player explore
• It took me a minute to figure out that my goal was the other green pipe.  It fades into the background a bit.
• You may consider being a little slower and more deliberate in introducing new mechanics, then letting players master them over on a subsequent level.
• The mechanics around bouncing vs sticking were a little unclear.  At first I thought I would stick to pipes and bounce off of bricks but then I bounced off of a pipe.
• A few times I died and couldn't tell why...
• I just figured out it was because of the limited bounces

Love,

Aaron