This is well-made and polished! It feels natural to control and the variety and spectacle of the attacks are superb. I do wonder about the shield though - it seems to me that it accumulates corruption faster than any of the attacks would really threaten to, and while I think it could potentially prove useful on phase 7 for dodging bursts of attacks as you get to a new location, it still seems too damaging of an option to choose, unless you know when the wave ends. But I do understand that it's a difficult balance to strike - make it too useful, and it might cheapen the player's experience. So I think you made good decisions in making this game. Well done and very unique and well-executed concept, thanks for creating this!