Fun! The leveling system is a great addition that really got me hooked, haha. Played probably longer than I should have telling myself that getting that next level would be what I would need to fly through the rest of the game.
Something about the attack feels a little off, but I can't quite put my finger on why. I think the white box that appears is the attack's hitbox...? One thing I didn't love was that if you attacked and then moved soon after, the attack hitbox moved with you. I'd have loved to be able to maintain the attack direction for the duration of the attack, if that makes sense. Or, maybe I'm trying to make excuses for how terrible I am at games.
Anyway, this is a really nice entry. Good work!