LOL yeah. Those were our thoughts too but we had to tone down numbers for the sake of the jam. I was afraid we would've made it too hard for certain audiences. The next version of the game will definitely be tougher when we publish it!
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Honestly, if you just nerf vampirism to be like, 10% of what it is (so like, you heal 0.5%, not 5%), and maybe dial back the chance rate of damage boost being an upgrade that shows up, you'd have a significant boost in difficulty overall for very little effort. But either way, I'm looking forward to the next version!