You actually did something very similar to one of the ideas I had for a game (not what we ended up doing)!
I really like the idea of a sort of "Tetris-Hand" for your attacks. There are some obvious things that need to be changed/fixed, but I get it. It's a game jam. That kinda stuff is inevitable.
Some of my notes were:
Spamming spells is the easiest way to go because both spells are just as likely to hit.
Spells last longer if you're moving more.
Lack of feedback on hits.
Overall still a fun thing and you managed to make a complete game so can't fault ya there!
Congratz on making a game for the jam! Well done!