PULSAR: Lost Colony is a co-op spaceship simulator where each player assumes the role of a crew member and a whole new campaign just dropped in.
Beta 31 brings in the new campaign which is smaller than the main story that explores a new Polytechnic Federation faction. They're a "group of sentient robots that have risen from the scrapped and discarded remnants on a waste planet" and they appear to have some advanced tech. Since it doesn't follow the main story you can expect some twists and turns including a special threat timer (which can be disabled).
For those waiting on the final release, the good news is that they're now focusing on bug fixing and polish to get it ready for the big 1.0.
It's been quite some time since last trying PULSAR: Lost Colony and they've added so much, it looks like a much bigger game overall now. Even going back a few years (it's been in EA since 2015) it was already a lot of fun, and it worked well on Linux. Once it's out in full we should hopefully be taking another closer look.