the original idea was to make a space trade with the mechanics of an updown shooter.
I think I'm going to leave this project like this. and I'm going to create smaller games. using the same sprites to develop the mechanics separately. and later I will integrate all the mechanics in one game.
in this link you can see the evolution of this game.
https://www.youtube.com/playlist?list=PLzUKqaOZ_U7OaiQMgVB1gnyyHgtAN2QK-