I unpacked the game to take a peak at how it works and I don't think I've ever seen such clean code, even from AAA game studios.
I'd never used Godot before but in moments I was able to make new maps, items, and creatures. After a while of learning the collision system and the syntax I was even able to expand the inventory by reparenting the items and changing their collision layers and masks to allow the womb and stomach to overlap almost entirely.
Still getting tripped up in some places, Godot doesn't seem to like when an item digests into an item that incubates back into the first, lol.