PULSAR: Lost Colony
Recently, Leafy Games released Beta 18, which vastly improves the character models, character abilities, and adds two new races.
And for the next week, it's 40% off!
PULSAR is basically you going around and exploring the galaxy with 4 other people, each person having a role, such as Engineer or Pilot.
While there are AI crew members available, it's more fun with friends, rather than acquaintances.