Having played this for a bit now, it seems like the game is its own worst enemy performance-wise as actually taking advantage of the many increasingly fast and scattering balls like the game wants me to makes it slow down to a crawl, which is very counter-productive when it's supposed to make progression faster. Even turning the visuals off doesn't seem to affect performance at all, so there's essentially a hard cap on speeding up progression before it instead becomes a lot slower.
I'm also a bit baffled by the boss mechanic making you not only refight every boss every time but also fight them an increasing number of times. The bosses themselves are a cool concept but adding exponentially more refights just drags out the game in a way that isn't fun and is way slower than any other form of progression. I get the skills are supposed to be special, but it's just too much and made me not want to bother.
That aside, this is a nice concept and I definitely had fun up to this point.