The Mesartian story is actually just a tiny part of a huge story that involves the creation of our current universe and a whole series of powerful beings (gods) and the wars between them. So I will try to make the long story short by quickly explaining the basics.
Mesartians were created when their ancestors were near extinction because of the war with a more advanced civilization. In order to survive they’ve put a capsule carrying a basic reproduction element at the distant planet of Mesartian set to activate after millions of years (so that their enemies would have already being destroyed by another civilization). Mesartians are the beings created when that capsule finally became active.
Mesartians are immortal matter-less beings; they are the creators of the human race and have been responsible for the whole circle of evolution on earth. Antimesartians are the handicapped Mesartians banned to another planet so that the race remains pure. As a revenge to Mesartians, they have fired an asteroid towards earth to destroy their creations. A few thousand of humans have escaped in large spaceships and have travelled for many and many generations in space. Eventually some of them reach Mesartian and start a war with Mesartians.
Humans (without knowing that Mesartians are their creators) fight them through special matter-less remotely controlled devices. Mesartians haven’t been ready for a war since they have been relying on a chaotic analysis future prediction device - that didn’t predict this event due to this universe collision with another one and altering the chaotic data. They are therefore in a very difficult position.
In the full story they eventually lose to humans but that’s not something I’m supposed to say in the game since the player will actually play as a Mesartian hero fighting these remotely controlled devices on Mesartian. I’m not sure how and if I will present all this information in the game - there is no actually need to - but I can definitely use all this story to create the theme of the game’s universe so everything has a consistency (I remember seeing snakes and bats as enemies in some NES futuristic platformer where you normally killed aliens and that looked really stupid).
Next time I will probably write about the game mechanics.