Hello!
A game called Iratus: Lord of the Dead is free to own forever from the GOG store.
As long as you get your copy before the 5th Jan at 14:00 UTC.
Game Description:
In Iratus you find yourself fighting for the forces of darkness in the role of the titular necromancer—Iratus, recently freed from his millennia-long imprisonment.
You control an obedient army of the living dead, with skeletons, zombies, banshees and many other unliving warriors. Create your soldiers the only way a necromancer knows how: from the body parts of your slain enemies!
Click the green button > Scroll down a bit > Press the second green button on the game’s banner.
Enjoy! 