I've played a lot of these "cannon" games, and after a while they all seem to blend together. That was the expectation I had coming into this. With that said, I was pleasantly surprised by how much I enjoyed this one. The timed explosion on the projectiles was a nice way to set it a part from the standard physics shooter. And, I don't know exactly how to describe it, but it just felt good playing this. Satisfying. Take that for what it is.
On the other hand, I did find it to be pretty easy -- beating most levels on the first attempt -- and it seemed to end right as things were getting interesting. I kept waiting for a level to load up with cannons in all sorts of different positions -- or maybe even other projectile weapons.
On a similar note, I would have liked to see more ricochet-type elements. Really take advantage of the physics engine: shoot here to make it bounce here to make it bounce there, etc. I suppose that is an inherent limitation when your projectiles count down to explode upon contact with a surface. Ah, I'm just rambling now.
This game is good for what it is: a nice, simple physics game. 3/5
-Cormac