I feel Sakuya needs a buff, also, there should be a way to clear the screen after some time like "rechargeable bombs" or something like that.
Overall, really great game
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Sakuya was originally so strong that she killed every enemy as they entered the screen, so I nerfed her a lot. Her 'gimmick' is that her bullets duplicate as they fly, so she does more damage from far away, so now that I think about it, I guess if you weren't trying to be as far away as possible from the enemies as you can Sakuya would be really weak.