Nothing to be done! Even at full health, even with enough ammo I can't even get past the first rooms of the lab part. My biggest problem are the mutants with scythes. They are enormously faster than me, and they deplete 1/3 of my HP with a single swipe. The corridors are too narrow to dodge them. Even with enough ammo, by the time I shoot one of them the others have already surrounded and stunlocked me to death. I'll try another day to see if I'm luckier!
Thank you very much for the update, I was finally able to finish this beautiful game! It was hard nonetheless, but much more doable than before thanks to all the additional resources. Thank you for listening to my feedback, you are amazing! I hope these changes did not ruin your original vision for your game.