I've never done this before - but a couple of days ago with Opus 5.5 on x5 Max account I started to decompile and port Banished to rust using ghidra and REA. It's not an abandoned game, but the last release was in 2014 and it's only available on Windows.

It's about 90% complete today, just working through smaller functions but the majority of the work is done and playable both natively and within the browser.

I'm now looking at a list of older or abandoned games I enjoyed and looking to see if it would be worth creating a modern executable for it.