It reminds me of Space Invaders for the PSX! The one where you fly around and destroy asteroids, and there are bosses, and the bosses take up most of the screen. I remember staying up until 2 in the morning playing it with my brother. You really brought the nostalgia out on this one.
Everything screamed 90s. The music even reminded me f the snow levels of Donkey Kong Country.
I wold love to see more enemy variety, and different maps. maybe some traps. overall, 5/5.