Thank you so much! There's definitely a lot of room to tweak the numbers (and more reasonably scale health and damage per levels). I think a big part of enemy deaths being confusing is that they just "shut off" after they die, which was a result of me setting the enemies up to ragdoll on death but not having enough time to implement them :(
Happy to hear you say you disliked the pixel shader, because it was a nightmare for our UI! It's mostly camera tricks, but that actually caused us to lose in-engine UI capabilities and we had to rewrite them ourselves. I would love the 12 hours back xD