I think it's a really cool game and the graphics are very cool. But yes, there should be some adjustments, I think, like this: If you have a planet you should be able to build buildings on it and you should be able to create gravity for your planet to keep it in one spot.
Also the main menu has to be nicer, it has not enough graphics...
These are just some ideas to make the game better ;)
 "Aurora"){kind=icon}
 "Potty Racers 2"){kind=icon}
 "Check Boxes"){kind=icon}
 "Heavy Weapons"){kind=icon}
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 "Red Remover"){kind=icon}