I'm glad you put in infinite continues; no way in hell I would have been able to complete this otherwise lol.
This was a pretty good boss rush entry. I think the main thing I found myself wishing for was like a diagonal shot like Samus or something because most battles kind of devolved into me sitting under them trying to dodge very short-run-up projectiles while holding down fire. Trying to jump and hover and fire accurately while dodging bullets was just too much especially when my flight time would run out and I'd drop into a hail of shots. Also I would often find myself running away from bullets into flight, but then couldn't turn around mid-air.
It's difficult to assess gameplaywise for me, since I don't think I'm very good at these, but would probably rank it as a bit too difficult. Some of those shot patterns are absolutely insane to try and keep track of for me.
I enjoyed the various characters and their art, but I think it was a bit difficult to keep track of everybody and even to tell what was going on. I liked that the cutscene engine managed to have slide-ins and emotes though - I didn't manage to program that into mine! What engine was this made in?