You have a super fun idea here! It's almost like an idle game but with a movement component. The artwork was super cute, and even though the sprites weren't animated I appreciated the little procedural bobs and bounces and such. I bet if you did this for the player character too (maybe a little squetch as they move around?), it would go a long way!
Not sure if it's a bug, but I noticed the magic shots usually going in the direction my mouse was pointing, but sometimes they went off in a different direction.
I think you found a really nice difficulty balance here. I barely squeaked by on the Meadow difficulty, and I think I would need a few tries to beat the Hell difficulty. I love the "oh CRAP" moment when a big wave of bats spawns when you're at low HP xD
Had fun, great game!