Really fun and the fact this is made in Pico8 gives it authentic retro charm.
I like the simple gameplay goal of try to survive and score as much as possible and it's also pretty fun having to adapt to each new pattern as you shoot the boss when she changes her attack.
If i had to nitpick i'd only say that having no autofire on the main attack can be tiresome after a while, but i also gotta factor in that it is awesome that there doesn't really seem to have to be a firerate cap so if you've got a good triggerfinger you can spam shots at an insane rate :p
I had a good time playing this, it reminded me of older computer games like Amstrad or C64 titles :)