I love the idea and use of the theme and I think the wizard character is really cute.
using some of the abilities felt weird, for example the dash ability boosts to different heights when moving in different directions. the game could use some polish, maybe an effect when a spell is cast. also try to let the music play continuously, and not reset every time the player dies.
overall the game concept is really cool, and with some refinements the game could become very good.