CyrilH, it's nice that you tried to post a solution picture for G2, but your link doesn't work. Why didn't you just use Photobucket or bayimg or something with a simple URL?
For additional difficulty: planets in orbit instead of fixed.
For additional realism: fuel is significant weight in ship; ship with more fuel on board takes more fuel to change speed.
Cheap way to get Gone in 30 seconds: Choose Selectionator, then do Armageddon (nuke + pipe bomb) repeatedly as fast as possible. You have about a 65% chance of completing in 30 seconds.
Killing the boss is entirely too easy. You can jetpack to the ceiling in a spot, close to the platform you land on to start, where you can shoot the boss but it can't shoot you. I didn't even get to kill the birds in the boss room.
 "Drop."){kind=icon}
 "Racing Comrade!"){kind=icon}
 "Seagull flight"){kind=icon}
 "Space Gravity Game"){kind=icon}
 "Insectonator: Zombie mode"){kind=icon}
 "Gluttony 2"){kind=icon}
 "The Legend of the Golden Robot"){kind=icon}
 "Mitoza"){kind=icon}
 "Flight"){kind=icon}
 "Rocket Toilet"){kind=icon}
 "Gravity"){kind=icon}
 "Love"){kind=icon}
 "Tiny Hawk"){kind=icon}
 "Rescue On Cocoa Farm"){kind=icon}
 "Blue Knight"){kind=icon}
 "Nephi's Adventure 2"){kind=icon}