The artstyle is delightful! The music was charming. The character animations were really well done too. The platforms were a little sticky: I had to quit one time because I got hard-stuck on some beams. There was some clipping and strange turning behavior when looking straight down that Theonixie mentioned. Other than that the controls were precise and intuitive. I ended up heading straight to the top to collect all the abilities before doing it again to get the books.
The count Jeffula sure does a lot of reading, dang.