I like the idead of lasting as long as you can. Maybe inlcude some pick up powerups, like smaller enemies, or even a weapon. Good work though, its a good start
I really like the art style of the game, it might have a flaw though as the hit detection suffers due the the wavey style not giving clear outlines or boundaries of the rocket/plane thing (:
 "Sky Runner A ~BETA~"){kind=icon}
 "Sky Dodge B ~BETA~"){kind=icon}