Neat concept! I feel like there is an opportunity to make a Dark Souls/tower defense hybrid here! I did find that circle strafing was a very effective method to dispatching those pesky pirates. Additionally, some feedback for when the player hits/when the pirates hit you would go a long way. I often couldn't tell which was which (I know that's what the numbers are for, but I think maybe the animations felt similar). Fun idea, so great job!