9.5/10

Most fun I've had in a game in a long time.

Good Things:
I was surprised by the fact that the campaign is not broken into segments like "Mission 1: Repair this base" Load Screen/Mission Select "Mission 2: Establish a Base at X under Y circumstances" LoadScreen and so on. It's all one big piece. Your base feels more like a home because of this, somewhere you've built and come back to in between scouting for new resources or expanding outposts.
There's not any hand holding, you're allowed to build whatever whenever wherever. And yes, this will allow you to make mistakes. I found myself learning the rules rather quickly. The game will teach you if you follow the campaign and prompts from your character/mech so keep an ear out, it may help.
At first I was a little daunted by the management of several different outpost's needs (power/resources) but as my research grew and new forms of energy supply came along, it became easier and I felt some relief. That relief encouraged me to build bigger and to keep going. I knew that with my new techs I could do more and get creative without penalizing myself.
Based on other reviews, I had a feeling going into the game that it was going to be a lot of "automation management". Like Dyson or Factorio but no. It's far simpler than that. I feel like a lot of RTS players who may be afraid to give this game a shot because of that should try this game out.
Graphics and Audio 10/10. Loved looking at it and loved hearing it, from music to the sound of my mech walking over puddles of alien blood, very satisfying.
THERE IS A DEMO!! A demo! Play it first if you are on the fence. It ties into the main game as it is the main game's prologue.
The flora and fauna are beautiful, each species brings their own value and threat. Some can be tackled or obtained quite easily while others will have you rethinking your loadout and base layout. The environment itself can be used to bottleneck or spread hordes out depending on how you use your surroundings.
If you like base building in AoE, AoM, C&C, even city builders, you may also find this enjoyable. This game made me look at other games like diablo and say "Why didn't Diablo allow WASD movement, it works here!" It felt right.
Like games where you upgrade and become stupid powerful? Try this out. Want to just build a base and go afk to see how long it can survive without interference from you directly, try this out.
There are a lot of things I can list about this game that I absolutely loved, but I won't spoil it by telling you everything.

Bad Things:
CARBONIUM STORAGE IS FULL, WE SHOULD BUILD MORE STORAGE!
IRONIUM STORAGE IS FULL. WE SHOULD BUILD MORE STORAGE!
That did get old real quick. There's an achievement for building x amount of storage capacity and even after reaching that threshold, my character/mech were still screaming at me to expand our storage. I hope they dial back the frequency of those announcements in future updates. That would be swell.

Overall, if I were to recommend a game to anyone in 2021, it would be this one.
Absolutely loved it. Best 30$ I've spent all year.