Great game 10/10.
I think i found 2 things that break the game (or maybe its intentional):
1. You can make 2 power heavy hasten spells and just make them reduce each others cooldowns and just keep the massive cdr active always.
2. You can make the Mega potion empower itself and just make a massive mega potion that gives a huge buff to potions.
I managed to bring all of my costs to 0 and I crashed the game twice with potion brewing speed.
Can't wait to see what you will add next to the game.