That was quite something!
First of all, extremely playable. I hadn't had a slightest hitch except for some FPS drops when the torch went out - which made that event EVEN MORE STRESFUL. Also, playing with a trackball I got extremely frustrated - between that, the mouse reshuffling the ingredients and customers ZERO PATIENCE SERIOUSLY WHAT IS WRONG WITH YOU PEOPLE?! I lost 4 rounds and these losses felt unfair. Oh, you expect me to brew not one, but TWO liquids for a potion, interspersed with ingredients that also require chopping and grinding, and meanwhile one of these will be in the cupboard and then the mouse will move it to the top shelf? Yeah, screw me I guess :D
But once I put the laptop on "performance" mode the slowdowns were alleviated somewhat, and adding a mouse in place of a trackball helped with precision and timing of brewing, and then I managed to beat the game.
All that's here in the game is already working, and working extremely well; I would only add that for this to be shippable it needs content expansion (different stages to the game, so there's a sense of progression; maybe a bit of story) and maybe some balancing - I can totally see the player starting off with half the ingredients and potion recipes, and gradually building up in complexity and hecticness.
Overall: 10/10, I think this is a real contender for the prizes!
P.S.
That was one expensive bulb.