The game is fun! The length of the game is impressive. You want to find all the spells. The lightning spell is very satisfying!
Even if the game is hard, it's still pretty well balanced too. I had to go over it several times. It would be interesting to have checkpoints so that you don't have to redo everything when you die. The code system is interesting, I like the idea, at least you can find all your spells quickly if you die. The mystery and secrets are there! Well done!