The graphics and the concept are good :)
But the difficulty of this game is really really REALLY complicated. Even with a summary sheet I messed up soooo many times.... You should add a summary picture on the game screen. And also black potion is too difficult to see...
Yes, I struggled getting the difficulty right. I didn't want to make the game too straightforward and I ended up going too much in the other direction. I will take it into account for my next projects.
Thanks a lot for your feedback ^^
PS: Actually, it was my first time doing pixel art, so I'm really glad that you liked it :P