Interesting mechanic!
The good:
> The mechanic is interesting.
> The levels are not too long, so it's easy to get addicted.
> The challenge progresses in a nice pace.
Things that can be improved:
> I think the ball moves too quickly, making it difficult to make consecutive moves while in mid-air. This gets worse when a puzzle involves a very wide area when you cannot necessarily "plan ahead" your moves.
Overall good game and good job!
P.S. I'd like to invite you to try and rate our game as well! https://itch.io/jam/gmtk-2018/rate/300343