How Should I Make This Top Down Game

should I make it endless or mission based
I got drones in my game that shoots a missile at you

 

I think that it all depends on you as it's your game. You can actually do both maybe make the default gameplay endless and also add missions to give your game more depth.

 

Make some scenes into missions or worlds ?

 

In stead of world menu make it a mission menu is that what you talking about ?

 

You can make a Menu of Planets (Worlds), and in each planet another menu for several missions (Levels)

 

the game take place in space not on planets you don't under stand like space invaders the planets are decoration

 

The Ex as in explore then you add the word space to the ex

 

The planets is just like clouds in a platformer game they go by you can't interact with them