This one gets easy top marks for "gameboy soul". I feel like I could have played it way back when.
Love your take on the classic platformer format. Being able to cook enemies into spells is a very nice idea, and once you get the hang of summoning and throwing your cauldron around, it becomes very fluid. All the monsters have very distinct visual designs and movement patterns, which is great to make them quickly recognizable, enabling the player to be strategic about how to engage them, and also give them personality of their own - the little glove hand guy, for instance, is a huge jerk, as far as I'm concerned.
One thing I'd recommend is adding an explanation of the controls into the game itself. I had to keep checking the itch page for which button did what at first (which isn't all that unlike having to reference a game's manual back in the day!), and that took me away from the flow of things at times.
All in all, very good job here! Cheers!