Very unique mechanic which I enjoyed!! I was going to suggest some kind of limitation on spellcasting like mana but I see in other comments there is mana, during my gameplay I never felt as if I ran out at all and could just spam lightning or draw a fire circle over the whole grid. With the wall upgrade I was having issues with it recognising it as fire which almost cost me my game a few times. But overall I enjoyed being a witch and casting spells on those who wish me harm lol and I thought you guys nailed the self explanatory aspect, everything was tutorialised very well!