This was a pleasant idler to complete, it's a bit of a bummer all the endings are either good or bad, I've tried to cheat a little and get the friend from floor 6 while on mutation 4 and then mutate into stage 5 or 6, but the friend just dies anyway.
With all the surrounding lore (the archives are short, but the story really interesting), I could understand mutation 5 being always bad, but mutations 6 having a good end if you really tried would have been great.
All in all, would recommend to all the humans (?)