Currently there is no win condition to the game so dont worry there in this build there is no way to win. As for the enemy bullets they arent spawning next to you but actually you are just detecting them unless there is some glaring bug somewhere. I think there is still an issue in the mine logic that when you spawn in a mine can spawn under you which I thought I fixed but appears not. Shooting cooldown is 5s and you are looking for the enemy subs as the primary objective and trying to avoid or blow up mines.
Thank you for your feedback!