Love it!!! Great atmosphere. I managed to finish all levels.
I think you could improve the gameplay by making it always aim even before you click, so that clicking only focuses on the power. That way you could focus first on aiming, then on power, which would give you more control.
Another alternative would be to make it Angry Birds-like, so that you "pull" (click and drag on the ball) to aim and shoot, and the further away you pull, the harder you shoot. This would also work with touch.
Although the graphics were great, it was a bit hard on some levels to know where to go and to identify obstacles and their hitboxes. So it was a bit hard to use the environment to your advantage, which could be something to keep in mind in future level design.
Other than that, really good job! I think it would make a great mobile game.