Cool! Good vibes, nice art, *great* music. The main jumping around mechanic with the mouse is nice, I basically didn't use spacebar.
I didn't really understand the interpretation of the theme however - the hero trying to defeat the wizard is the mouse, right? And you play as... the wizard's cat?
I got softlocked twice - once between the bookshelves you mentioned, and once trying to push a dresser through the gap near the floating section and it got jammed in there and I couldn't get down! :'(