Sorry for double posting, but on the gameplay side of things, I ran into a super rat almost immediately in the sewers at the beginning of the game. I call it a super rat because it basically destroyed the heroine in two turns (to be fair, it did give a warning when the battle started). I don't completely understand how the finished battle system works yet, but I was still able to do actions after the heroine lost all of her HP, whereas you couldn't do anything but watch her get beat up/raped in the demo at that point. I managed to build up enough TP after she fell so that I could use the 100 TP attack and regain all of her health, though it took two of those moves and a bunch of normal attacks to put that rat down.
It gave a bonus of 5,000 credits when I beat it, which is really nice... if you're not using Cheat Engine, that is. I'm typically a dirty rotten cheater, though, so it means nothing to me. Still, seeing as how I've only collected about 179 credits through ~10 battles and opening up a bunch of chests without that rat, that's a big bonus. Just something interesting I wanted to post.