Hmmm..nice little game, nothing totally new..My advice: the controls (clicking the left mouse key or space) should be written first as you start the game or should be the first line in your Author Comments. I got some hits till I found where it is written in your comments. Or maybe you should not start the game right away as I hit start.
The controls itself were a little bit too slow..maybe this is improved by the further upgrades, I did not try. What puzzles me: How is it possible the first enemy gets injured when I collect his cannonballs? Anyway, played games like this before, not much innovation here. If the enemies or the character Constance were more funny looking or the overall game would not be so sincere in is goal, it would be more fun to play I guess. It definately needs some uptempo music or some relaxing groove. Keep it up, if this was your one of your first games, it was a good and steady one! At least it is playable and has some upgrades, this is more as some other games like this offer:)