Cool idea! I love the fun art an characters!
Couple of things to streamline; Maybe make the tutorial more in-game? Reading a bunch of text can be boring (Though you did a fine job explaining!) and having the player do it themselves can help them get used to the game faster.
The hand of cards is also hard to interface with. It's difficult to always have to drag it up to see what it does, and it's not very clear what effect the slimes have and what the extractor does. Perhaps include how to make potions in your tutorial? I know that the grandpa says to feed the slimes but idk what to do with that...
Just a couple things for improvement! Overall a really neat idea, and fun to play once you get the hang of it. :)