I don't see much benefit in trying to avoid healing the enemies. It just results in having to do much harder dodging while shooting the enemies themselves less. Meanwhile simply shooting like mad will have a chance of destroying stuff while allowing staying still against shot patterns that usually miss entirely anyway.
I think having something really important be off to the side in a bullet hell game is a bad idea. It means the player has to constantly be changing where they're looking rather than just focusing on the action.