Graphics are super charming, and its well polished. The UI could use a bit of work though, particularly the coins display could be more prominent. You cant even see it right now in the web build until you go into full screen.
The other problem, is that the movement feels too punishing right now. Since you cant attack after moving, if you move into the enemy you just get hit for nothing. So I find myself just waiting to get an AOE attack instead of ever moving. I also think you need to prioritize a tutorial / intro, cause I found myself pretty lost trying to understand the mechanics in the beginning.