Cute little game! I dig the spritework.
Fixed positions is interesting, and I can definitely see where this game could be expanded with things like upgrades and new spells, and maybe some more mechanics to spice up the gameplay.
My initial experience was mostly filled with confusion, unfortunately, it's kind of hard to tell what's going on and I didn't even notice the turn indicator at the top at first. Some work needs to be done to make things feel more alive and interactive - even just adding some animations would make it feel way better.
Sometimes enemies would kill eachother too, which I might doubt was an intentional game design choice, but I think there could be something interesting there to run with.
Good work!