This was often a topic, but Fatshark, take the Darktide expirience and create a hordbase shooter where WE play orcs.
the sheer creativity and fun you can put to work here is limitless!
Orcboyz, wierdboyz etc in a 4 player coop game, with a ton of enemy variety from Guardsmen with Spacemarines over Tau with their fancy toys to Chaos and Tyranids.
OH, and dont fear to take a big piece of inspiration from this fan Banger!!!