I've played with both keyboard and controller, Its cool to see those options. From my subjective experience not being able to move while being stuck in the attack animation do feel stiff as other have mentioned, But even so the boss fight experience are still fun! The art style reminds me of the game Hades, I like it. The thematic title & UI for buttons, health bar is also a nice touch!
On a side note it is indeed cool to see another boss rush as you put it Choclified XD
Are you all planning to update the game after?