[Forever-Free Friday] Lunacid - Tears of the Moon, retro 3D dungeon crawler
(store.steampowered.com)
I guess that comes from it being made with a game engine from 2000
OS *: Windows XP
* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
Sadly you can't just install it on win xp though