Let's get the obviouses out of the way, game feels a bit unfinished, it's gorgeous and bosses are underwhelming.
Outside of that I think a few tweaks would make gameplay much more enjoyable, faster cast time for spells, faster movements, more juice in general (bosses getting hurt visually, screenshake, more sound effects etc.)
But I liked the spells, the boulder one is fun to throw, the fire one is great to use, I really think it's not that far from being really good