The presentation of the game is very good. I like how you can see your alchemist in the background of the combat pane on the left and you can see boss behind the alchemist on the right. The menu goblin is also very cute.
For the gameplay, it would be helpful if there was a button to click to brew the potion; the functionality of the spacebar is not conveyed in game (as far as I could tell). For the most part, I couldn't try to brew any specific potion and just hit space as soon as I saw the cauldron turn green.