This is a really cool idea, I very much like the mystery dungeonlike tactical angle. Actually brewing potions though took a lot of time for not quite enough reward IMO, I think either a shortcut system for potions you've brewed before or just bigger effects would have gone a long way (e.g. rock potion moving more than 1 square at a time, ice blocks spawning maybe a 2x2 or something), especially because I kept dying and having to restart. I also would really have liked some kind of preview to know that I was gonna blow myself up, too many times did I die from my own explosions.
The presentation was also nice, I thought the hopping around was nice and the graphics were good!
Designwise though I thought it was otherwise excellent, the level prompts gave just enough and I felt like I did discover my own potion recipes! That was fun. I felt like I had options to solve levels too. Sometimes I would build ice bridges instead of bothering with the rocks b/c I perceived it as faster.
Good job!