Cute little game! I got a score of 1310.
Imo, the contrast between the enemy ships was bad and i couldn't see them well. Like, the colors on the ships were dull. For pixel art, a fix is to add a black outline, but it's hard to do it correctly and fit your general style. I think the donuts were ok, but the main fun of the game was not trying to die.
The controls made it hard but I got through it.
The hearts should be more visible, the enemies should be more visible, and the controls should go diagonally too if you know how to do that. Overall, 7/10