Anyone ever heard of NanoLemmings? I didn't.
https://pyra-handheld.com/boards/threads/pandora-nanolemmings-original-game.73148/
Here is one more link about that tiniest lemmings so far:
http://repo.openpandora.org/?page=detail&app=nanolemmings.wb&p=1
Looks interesting at least, and the review are positive. I'll have to try it out sometime.