The game should have a different ending.

The game should have a different ending. Instead of just making a rocket and finishing the game, there should be satellite technology and each player should launch some to have access to the entire map of post-apocalyptic Earth. In the end game, you would have to have the biggest industry in the world. It could, for example, have something similar to the contracts that you would have to fulfill before other nations to become the captain of world industry. The great post-apocalypse nation.

Might be true... if it only was "post-apocalyptic Earth".
Currently players themselves choose setting for playthrough.
And thus, what to consider being ending.
That part of game is convenient feature, just let's not confine it with certain plot.