About NEMO
It's dodge game.
The earth was exploded by nuclear war.
Right before the explosion, the Men launched spacecraft named 'Nemo' with last hope.
To spark hope to find another earth...
But other planets of the solar system destroyed the earth that is their brother and didn't forgive humans who ran away.
Therefore, they prepared ordeal so that spacecraft "Nemo" can't get out of the solar system.