Okay, first of all: Cool graphics.
This game looks pretty good for the limitations of the jam.
The game is also fun. First it's hard to hit more than one target but as you play more you get better at guessing how you have to shoot to hit targets at different distances.
I also like the idea of having powerups in this game (I know it's the theme, but still). Even though I pretty quickly settled on a tactic to never change the angle of the cannon and only variate the power of the shot, so one of the three powerup types I never touched...
I had fun playing this game and it's nice to see how you get better at it.