Take a look my slow-moving, retro, 3d adventure game "Merc". It's an alternate sequel to the 80s game "mercenary" for the commodore computers.
Play the game:
http://uzudil.github.io/merc/
And if you feel like contributing:
https://github.com/uzudil/merc
The game can be completed and has various endings depending on your choices.
Thanks!
--U