Really cool game and surprisingly difficult! Took me a long while, but I eventually finished the game! I never really had to use the items though nor did I have to buy any of the charms, as I didn't notice any impossible rooms after the example.
The art is great, everything feels very alive due to the animations! The music is also great, though it does get a little repetitive after an hour or so XD
Game fits the theme well, and everything feels very polished! Had a lot of fun deducting all the possible options, the later puzzles were fun especially!
Did notice a few very little inconsistencies, though do correct me if I'm wrong, as for some reason I make false math problem accusations quite often lol

I know the 1 and left 5 are interchangeable in this one, though I feel like 5 should be correct nonetheless

Same thing here, everything is correct if I'm not mistaken
These are very minor things though, and should be easy to fix I think! Nonetheless it's a really nicely made game. Great job, especially for a solo-dev! Definitely one of the most challenging games I've played this jam :D