< what happens to your Keys if you die? >
You are able to hold multiple Keys simultaneously. For example in Babies, if you give yourself 1 with the Cheat Menu, then pick up the 3 in the level, you will have 4 total (screenshots: Backpack, Cheat Menu)
In the Cheat Menu you can not increase your Key count past 1. But if you already have more than 1 key, it will let you decrease your Key count haha.
It also seems that you can’t bring keys in or out of a level; your key count gets reset to 0
Infinite Item Glitch also doesn’t seem to work for keys