Very strange game for sure. Music and enemies are really off-putting and seems like to etierly different project, but the main gameplay is quite fun so it doesn't really irritate.
The main characters are good, but don't really feel different... Encountered bug on every playthrough I got some white screen filter that stayed permanently, also after I beat waves the black book is no longer active, so there is no choice at all. The wording is little misguiding as well, it took me a couple of waves to understand what "charging" means, and what is "superjump" is still mystery to me)
But the idea is fun and with the proper polish it would be a great project!