I like the clown boss, average interaction with a clown if my experiences are to believed. The moving platforms are such a good addition to the fight, adds a lot of tension on if you can get up to the boss's level for another set of shots before he spins his face at you
That boss can also push you out of the stage, minor bug but I needed to reset my game because I couldn't get back on the stage
Also, I thought the controls screen going right to key binding, gave me a feeling of "why don't YOU tell me the controls???" which was pretty amusing and it was probably easier for scope as a bonus