I started with top sellers and kept scrolling looking for interesting with 50% or better discounts.

Detroit: Become Human ($4, 90% off) - mostly narrative game with choices, great graphics, good sci fi story.

Halo: The Master Chief Collection ($10, 75% off) - all the Halo games before it went MMO

Mass Effect Legendary Edition ($6, 90% off) - all three Mass Effect games plus DLCs

9 Kings ($10, 50% 0ff) - early access game. "fast-paced roguelike kingdom builder". Cute graphics.

Marvel's Midnight Suns Legendary Edition ($20, 80% off) - tactical card-based combat with Marvel characters.