By Nekogames, of Parameters and Cursor^10 fame: Defragger

For some reason it's not linked off the English version of their games list, which may be why no-one has heard of it.

Indeed I have never heard of it before! Thanks for the link!

I have also been notified about a PICO-8 game: https://www.lexaloffle.com/bbs/?pid=49180
But then again, what's not amazing on PICO-8, anyway? :D