it's got 5 levels and a continuous one for getting the highest score on the leaderboard.
What upgrades or challenges could I add? Ideas welcome, thanks.
Jets are designed for lightning to travel through them but it's still very dangerous especially from multiple strikes. Also lightning is a unique gameplay threat rather than the usual missiles, fighter jets, or birds...
 "America Nuked!"){kind=icon}
 "SuBo"){kind=icon}
 "Storm"){kind=icon}
 "Distopix"){kind=icon}