I enjoyed the story and game concept behind this. (can't comment on the strategy aspect, since I didn't have anyone around to play it with)

Not sure if I followed the instructions correctly, but here's my interpretation:

To play, I've printed all three sheets (36 ingredients, 5 power labels, 4 power cards) and colored them.
I left out the check and steal cards, as i couldn't mentally fit them into the deck (you can't have them as ingredients, and they seemed redundant). I ended up using them as rat markers.
The power costs (symbols and amount) are randomized each game, with one power being left out. To play a power, I discarded the given amount of hand cards with the matching cost symbol as my turn. (except for "Two", which is passive)

To introduce more mayhem, I could see an addition to the ruleset working well here:
When a player attempts to craft a potion, he peeks at all the ingredient cards.
 - if he succeeds, the ingredients are revealed to prove his success.
 - if he fails, he only has to point out which of his cards were correct.
This keeps the rest of the players guessing, but gives enough information for the minusing rule.     

Clever concept and mechanics! I really like the creative way you interpreted the theme of the game jam too. :) I would definitely play this!