This game seems to be unfinished yet have a considerable amount of polish. I love how dynamic the enemies fall down after getting hit. The explosion caused by the Anna's bullet is beautifully done. I also love the boss' BGM, it sound funny yet chaotic at the same time.
For me, Anna's hitbox is quite obvious. Anna's necklace is suspiciously bright and contrast to the rest of her clothing. That screams hitbox, imo.
The balance could be better though. It's kinda unfair for the enemies to do high speed vertical shot when above or under the player, not to mention how small the play area is. The boss also keep spawnkilling me if I got careless at the end of the stages.
Overall, this is a fun game, just a little bit rushed. I also like the direction of this game. Good job!