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This indie games boss fights are an animated musical! Very cool!
(www.youtube.com)
The game is only in pre-alpha, but this is one of their bosses, a silly ghost owl! Hoohoohoo! 
This game looks CUUUUTE! The songs are catchy too. 
This looks rad I know it's still in production but I really hope they can fix the sound mixing to make the attacks feel less flat. The knife swishes and lightning are begging for some big musical theater style sound effects.
I can see all the attacks that are timed with musical cues but they feel disconnected from the song and the physical environment. Playing it I feel like it'd be less of a feeling the rhythm thing and more just rote memorization or reflexes.