Cheers Paronamixxe, but what do you mea by "depth effect" stars? Do you mean stars that drift across the background? If so, yeah, I will probably implement something like that in the future, after all the essential parts have been added.
For now I'm focusing on getting the basic game out onto Google Play.
I spent yesterday replacing the yellow debugging text with icons and whatnot, but it's slow progress.
I've also spotted an annoying bug with the planet shadows. I'm faking the shadows with a second sprite that is rotated to face the sun. Each loop the sprite is moved to the same position as the planet sprite and rotated to the sun, but it looks like the physics sprites are moved, just before they are displayed to screen. This means my shadow is always a step behind the physics sprite. So it looks like I'll have to break the "Sync" command up into its elements to ensure the sprites are synchronised to the same time step.
Anyway, the three things I want to fix before I up load are: Getting to game to recognise a successful ending, Correct Facebook login, Correct Advert Implementation.