I don't hate it but it really only has two design ideas on repeat:
>attempt to overwhelm the player with visual noise
but then you just stand back and watch the like 4 moves tops bosses have and see where the safe zone is and ignore all that
>Platforming that requires sudden reflex moments to get timings right
Which is only a thing to work out once and then it becomes muscle memory or worse is never needed to be traverssed ever again.

Its not a bad game but you can tell its a dlc to another game stretched out with stuff like square wave fight rooms everywhere to pad it out.