Endgame needs tweaking
So I'm playing right now on the "medium" difficulty. I've killed off most of the pirates, but now there are a few that are refusing to even try to attack, and are just huddled at the bottom of the screen out of range of all my turrets. They will pop up from time to time, but they have just been hiding out down there for over ten minutes now. I sold what I could and put some spear towers down there, but now they just burrow and seem to be interested only in drawing things out forever.
There needs to be a "fast-forward" button and/or a feature where you win if you have more lives remaining then there are pirates left on screen. I've still got the game going on popup in the background, so we'll see if I ever manage to kill off the last few pirates.