Overall a pretty fun game! Its fun to play and the music works well with it.
I feel like there's not enough grace time before damage can start. You can learn how to avoid it pretty easily but can be weird to people playing for the first time. Ways to fix would be to either spawn the player and the enemy on opposite sides of the field or just have 3 seconds where nobody can die.
The shooting happening based on movement and not ship direction doesn't feel that great. Its hard to gauge where your bullet will go if you're trying to move around quickly and its not very realistic since typically cannons will fire from one direction on the ship.
I found a slight bug if you survive for long enough in a round. The camera zooming in makes the movement center go off your ship which ends up making it hard to go the direction you actually want to go in.