Hi, foremost! Thank you for your feedback!

Yup, its sort of a prologue. I agree that it sounds a "long" story, but this should be two pages of a storyboard only. At least that's how I visualize it. Much of what I wrote can be better represented by a few drawings. That would make the prologue faster and jump straight to the story of the Nanomonsters. I think as a game, I would imagine it like this:

Once you "open" the game, the prologue starts with a quick animation (could even be just a few stills like a comic book). Prologue ends with nanomonsters starting their journey. Then go the the game starting screen (Click start to play, options, and so on). Once you click start to play, then there will be the story of what happens to the nanomonsters during the journey and then the adventure begins.

Ok! I will try colouring this map!

Regards,
Diego