Top marks for everything that's there so far. Going after "krystals" seems somewhat meaningless since they persist after defeat, meaning if you use them in a boss and don't get it, you don't get them back and you're using the fireball anyway. Having a boss health bar would help though, show that one weapon definitely deals more damage.
Looking forward to what comes up next, hopefully with some more verticality in the levels, really put that flight to use.