Really like the game, probably one of the best PICO-8 and schmup projects I've played in a bit. Love the designs of the ships and enemies, as well as the backdrop. I really like the variety of attacks and the simple controls. Backing up what Marty_DYR said, the yellow enemy fire can be hard to notice amongst the fire from the player so that may be something you may want to change?
Also did you make the music or did someone else, and do you know of any other music they have made?