Awesome game, cool graphics and gameplay. You could add upgrades in the game like more of those crews to shoot the enemy and new mobs after each wave or something. Anyways cool game. Good luck.
My original plan was to add ability to heal friendlies, and maybe add incoming cannon fire to avoid, maybe even brutes / bosses etc, but ran out of time in the end, we'll see how it's doing after jam, maybe I'll extend it more :)