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I really like it. Evey stage of boss is really different and requires different tactics. Thats nice. Some constructive opinions:

For most stages of the game best tactic is just run in circles. Maybe some movement prediction would be nice?

Pushing gun is so powerful that it often kills boss. I found that not using it and just spam bosses around is more convenient. I don't think it's idea you had in mind.

I really like your aesthetics.