Epic's store is even more Windows-only than Steam's and you can't filter based on OS and the UI kind of sucks. Anyways I'm just going through the sale list and picking the first five interesting games I see.

MechWarrior 5 Mercenaries (Standard Edition) (Windows, $50, $35 sale) FPS Mech combat in the BattleTech universe.

Civilization VI (Windows, $60, $15 sale) Even though Civ has gotten too complicated still an excellent turn-based strategy game.

...ok, only saw two interesting games that I don't own.