Art and Musik are awesome! The brewing system is cool and if you continue with the game, you could add some more depth to it, but i see you already planned it with more prima materials and some kind of stones ;)
Unfortunatly I had some bug on the final bird boss where he had no HP left but the fight didn't end. I still could brew health potions but the black prima cards where labeled "placeholder". When dragging the placeholder over the brewing station nothing happened and the cards didnt disappear.