Ran into a game-breaking glitch where if your soldier is in the middle of doing his third killing-strike against a fishman at the same moment that a new fishman lands on your ship, not only does that third-hit not kill the first fishman, but that first fishman gets full-health. I ran into a hilarious loop where a new fishman would board during my kill-strike 3 times in a row so I had a ship full of 3 unkillable fishmen and even a fourth one tried to board with the same timing but there was no space left.
Was also able to have 3 pirates on my deck at one time, though I don't remember how I did it as I was panic clicking. I think I might have clicked between 6 and 7 with the mouse rapidly and it sent them both out one after another even though I had captain out already also. I thought having 3 out was going to make for an easy game but once I sent one of them away, I still had to send a second one away before it would let me bring out someone new.
Also, there's a music glitch where if you die during a storm and restart, the game still plays the storm sound effects non-stop and you have to refresh to get rid of it.