This plays really good! It feels great to use the big spells, very impactful, very fun! It also looks really nice and gameboy-ish.
I just think the balance could be better. If you spam the fireball enemies will always be kicked back. The only situations I got hit was when I wanted to use the big spells and came closer. So maybe there could be a limiter for the fireballs or more resistance for the enemies. Maybe ranged enemies could have helped as well.
But really, it was a fun short experience. I think it could also work great as a (local) co-op game, outside the GB theme. I would certainly play that!
Well done :)