Health and bomb upgrades shouldn’t be respawning, that’s definitely a bug. Though, tbh, given how hectic the final boss gets, maybe not the worst thing to have, heh.
I don’t have separate endings yet, that might be worth trying out, maybe by collecting all of the vials, or by having one of the scientists leave behind scattered notes on how to remove the lenses.
I tagged it “horror” for a reason, though.