www.NJLanParty.com

I've been playing this for a few months. It's very well done, decent immersion, it's free to play and not all that limited without spending. No micro-transactions but has a reasonable (to me) subscription.

Basics is that you're remote piloting a rover on a distant planet exploring and collecting samples.

https://extrasolar.com/

Checking it out now.

It looks like you get something in game for inviting people.