Real fun to play and i like the fact that you free roam an arena instead of it being an autoscroller
you also did great with the sprite and music i like the ship designs and that tune is catchy ^^
the main issues i found personally were that some of the bullet pattern are so tight that you don't know if the hitbox is gonna fit or not and the arena is so big that you can sometimes just wander for a bit before finding where the enemies are, so a minimap in that case would have been super helpful, not really huge issues though so they don't take away from the fun.
Had a good time, good job :)