Look, I don't really know what kind of organism the main character of Rain World is. Who knows what bizarre experiments or breeding rituals brought him into being. Nevertheless, he/she/it is alive when nearly everything else is dead. So, y'know, points to him. Make sure he keeps living, won't you?
Rain World is a game that's the work of two people, Joar Jakobsson and James Primate. They've spent two years building a world where rain is deadly, monsters will kill you and you control a slugcat that's a lot cuter than anything with the word "slug" in its name has any right to be.