The delay between actually deflecting is atrocious, you press to deflect and it takes him like a whole another second to actually do it. The piano hitbox is also scuffed, there's like at least about 15 extra pixels that can be hit in front of it. I also love how deflects which would've been x100 suddenly get thrown completely in the back where you can't deflect them. :D
Also at some completely random points, they start throwing so much sh1t at you it becomes undodgeable OR undeflectable. Just an unfun RNG game with annoying or clunky mechanics, at least visually, it doesn't look like complete shite.