Game category: Strategy

One Deck Dungeon
The hit roguelike with all the fun of a dungeon crawl in a single deck of cards!

One Step From Eden
Can you make it to Eden or will your destruction be imminent?

Onigo Hunter
What lies beyond the doors to the ruins? Become the best hunter in the world!
Onion Force

Ord.
Ord. tells stories three words at a time.

Organ Trail Complete Edition
Organ Trail is a retro zombie survival game. Travel westward in a station wagon with 4 other survivors, scavenging for supplies and fending off the undead.

Othercide
Descend into Humanity’s last hope. The Daughters, echoes of the greatest warrior to ever live, are all who stand before Suffering and death.
Otherwar

OTTTD: Over The Top Tower Defence
A Tower Defense/RTS game with RPG elements

Out of Space: Couch Edition
A local co-op multiplayer game about living together in a house in space.