Excellent Game.
It's a very simple yet occasionally difficult design, most of the levels are very cleverly deceptive and can catch you out if you don't time the drop right.
One thing I've noticed is that (at least on level 13) it's possible to become so large that it's impossible to finish the level; the obstacles move in such a fashion that you can't get past them.
Perhaps it would be an idea to have the obstacles carry on moving while you're inside the cannon too, more than once have they stopped in a very undesirable place making the cannon useless.
Apart from these small criticisms this is a good way to pass some time and have some fun. 10/10 5/5