Nice work! I feel some balance changes could really shape up this game, but I feel like most of what you need is already there.
Game jams are hard, but if you're interested here's some things I noticed. The text in the beginning has important tutorial text / lore drop, it would be nice to have some time to read it before the round starts. Sound effects would reaaally take this game up a notch. These types of games tend to value how satisfying progress is, so having nice sounds when leveling up / landing spells would help. Also, I wish I couldve seen the other enemies, but I saw from another comment that they spawn after 15 minutes, but again thats a balancing thing.