not all 5 stars because i noticed a bug... which in the end caused another bug...
Love the idea and how it all works.
Fat cannon is the second bug i noticed, if it leaves too many bullets, it majorly slows down the game.
Now the first but is more serious, after the bonus wave i got a "game over" or something like that when my ship hit the bees, and the game resumed with 0 stars and lv 1... nothing unusual BUT! at the end screen of the level, the stars continued to show, and i could collect them as much as i wanted! with the game actually counting them towards gathered in the level!, once i collected enough to unlock the big gun, i had accidentally collected the big gun bonus and started shooting (while still on the scores screen), which started to slow the game, i clicked play hoping it would reset the script, nada... still slow but i stopped "farting" with the big gun which was kinda endless!.
One minor thing i would change is leave a bit more space between the mouse and the point at which the ship starts/stops breaking, it's really hard to aim without hitting the bees incidentally.
O(ne tiny other adjustment, i lacked some music ;)