The game was fun, but I think there a bit of a missed opportunity. The speed increase and the clouds slowing down was surprisingly fun because I was just try to fall faster and faster without being slowed, almost giving me a bit of a sonic vibe. However the obstacles took away from the speed which is fine but I think it would be fun enough just building up speed and polishing that part more.
Also a small tweak I would suggest would to have the box higher up the screen to allow the player more time to see enemies and move accordingly.
The art style is simple and works really well. Also I'm in love with that little bird sprites. They're adorable!
Overall a great submission!