@fribbledom I'd recommend these open-source games. They're *huge* time sinks:

https://www.openttd.org/
https://endless-sky.github.io/

There are also these freeware games:

http://egomassive.com/ks/ (and http://nifflas.ni2.se/games/Knytt%20Stories%20-%20A%20Strange%20Dream%20102.exe )
http://www.supercratebox.com/
http://www.postudios.com/company/games/thesilverlining/
https://spelunkyworld.com/original.html
https://archive.org/details/CaveStory
https://archive.org/details/La-Mulana
https://jayisgames.com/review/an-untitled-story.php
http://www.retrosouls.net/?page_id=614
https://www.supermariobrosx.org/
https://sites.google.com/site/broguegame/
https://ifdb.tads.org/viewgame?id=aearuuxv83plclpl

...and more if anyone is interested.