Perhaps we chould choose the shader style we want ? why not ?
With dark ugly lines or not ?
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Anyway , i played the game, it's really; for the planet it seems to be a SIMPLE skybox, and with very far effects on some transparent polygons : The result it's it works just great.

I perhaps i've played too much RPG games LOL laugh
caus when i playde this space game i felt a great joy controlling a ship and blasting things and the music, graphics , voices are great.
they put the minimum for character faces on screen for video transmission, but again it works just great.

I'm now motivated to make a space shooter or space RPG game lol laugh
( and that's lot lot more simple than a game with a character to animate indeed )

Just do It !!

http://independentcreator.over-blog.com/pages/3D_Models-7792999.html