Story draft

You are part of the national defense system operating in space, whose task is to ensure that threats from outside the earth are repelled. You destroy asteroids and meteors along the way, sometimes single ones, sometimes swarms. Sometimes bigger, sometimes smaller. Every time you complete a mission successfully, you get money that you can use to develop your platform against future threats by upgrading the armament and increasing the protection and increasing the fuel tank.

In short: The player receives information that a new threat is coming. The player must locate the threat and destroy it. When the threat is destroyed, it becomes a kind of compensation for the player, which can be used to develop the platform.