A map is definitely planned, they just can be a bit complicated to set up properly - I've got to figure out what method will work best for the game.
For some reason the variable that checks when the game is supposed to be fullscreen is the one I've been having issues getting saved consistently - I'll keep looking into it though.
The original plan was that later enemy health values will scale up a decently significant amount, and the existing upgrades already well surpass the power of current enemies in game, so at max rank several perks make you VERY strong. That all said, I'm definitely still playing around with the balance of everything, the cost of perks, and more - unfortunately I probably won't have a super clear idea of what "balanced" will look like till I have a more significant portion of the game developed, but I'll try and keep things in check as development goes along. I just made a similar nerf to the augment strength perk for similar reasons. The recent update DID add an option to disable passive digestion damage though, so if you feel you've upgraded acid damage too much to be able to see the live prey animations, disabling that should help!