I really dig the concept of this and love the NPCs in the potion room! Each character feels really unique and has interesting design! The writing was also good for their dialogue. With the gameplay, I also really like the tradeoff that each potion has to impact gameplay.
My one critique is I think you could lower the difficulty a bit to make it easier to complete the game in one sitting. The reset from level 1 felt a bit harsh, especially since there were some one-hit-kill mechanics at play. I would have kept trying to beat the game if I could have continued the level I died in.
Overall, a solid start with a lot of interesting choices for the player to make with their potion arsenal, even though I only used the starter potions. Good music, art, and atmosphere with a lot of enemy designs filling the dungeons. Nice job!