All around pretty good mod, I like the flight and getting to pelt things with icicles is cool, but there's two flaws in my opinion.
The first one is that the bosses are a bit too durable. Since 1 healthbar equals one hit, it takes a good while to whittle down even the first boss. This seems to be a pretty common take, though.
The second one is that, in my opinion, ranking up is a bit of a chore. Since you don't get much per enemy (most I've gotten is 2-4) and it's not a guaranteed drop, actually reaching full potential is incredibly difficult without taking hits. I don't think it would hurt for things like ring boxes to give a small chunk to help you get going without having to massacre everything you see.