Undercopter - Cave exploring with a depleting fuel supply

It's damp, chilly and wet outside so what better way to spend the day than inside playing some free games. This is ' Undercopter ' by Xanthus, a remade game for the Pico8 whereby you are piloting a tiny green helicopter deep underground in a very large cave system. Your task? To survive and collect everything before your fuel supply runs out for a high score. Just be careful of enemies while