I've been thinking about adding a plot to the game for a long time and came up with something like this.
The year is 2198. The main asteroid belt of the Solar system.
At the Plato space research station, an experiment is underway to create a long-term traversable wormhole in a dodecahedron filled within antimatter. The experiment is broadcasting to the entire system.
Inside a 12-kilometer cage, during the experiment, for a moment is created a wormhole. In its place, a large alien ship appears, similar to a sea clam with two rings around it.
The ship with acceleration breaks through the structures and, after a short pause, starts an attack with missiles.
AI at the production space ship Vodorod-Yug receives an order to evacuate people from distant lines to Earth. Vodorod-Yug is a mining facility with human-based artificial intelligence which using mechs to mine and deliver ore.
The clam catching up with the Vodorod-Yug near the Earth and launches a rocket. The facility is heavily hit and settles to the bottom of the Atlantic Ocean. Soon, an orbital bombardment of the main cities of the planet begins, and then an invasion.
AI decides to wait out underwater and rebuild the ship into a walking city.
The artificial intelligence of the station will have to arm the miner-mechs to fight the invaders and find the necessary parts in order to fly away from Earth.
It's the first version.
Feel free to make suggestions.
Update 20 is delayed.
I plan to add storyline, pilot skills, and unique locations on the map.