I had a quick play, but I'm at work so it was quick.
The demo at the beginning was annoying me as the first message about aiming wouldn't disappear. Once I managed to get past that I thought the game was good.
- The guideline is a bit misleading, when you're close to other objects it just assumes you can get past them whereas when you launch the ball it hits them, not sure if that's by design?
- I would maybe makethe touch area for launching balls larger as I kept tapping below the cannon and it kept moving it.
- Also are there controls to set the aiming relative rather than absolute, what I mean is rather than tapping where to aim enable user to tap and hold anywhere and drag. I hope that makes sense but I can't think of a good way of explaining it.