Pilot, your brother is a polar explorer. He got in trouble!
Just take him home!
Hints:

First, learn to land your aeroplane;
Lightning and birds do not damage you plane while it is on the ground;
Low throttle->low fuel consumption;
Storm clouds can be passed above;
And... just take your brother home!

The game can be completed in ~7-10 min...
I will be glad your feedback.
Binary builds are here: https:instead.itch.ioaa
P.S. This is my first PICO-8 game. PICO-8 is awesome. :)
https:www.youtube.comwatch?v=8LT7JFxVNpA
Changelog:
1.9

repair chance reduces.

1.8

hard mode balance;
repeat key delay fix.

1.7

hard mode;
rank fix.

1.6

rank is shown at the end;
camels added;
you have chance to repair engine on the fly (press zx fast);

1.5

ballon collision fix;
refuel while throttling 0 fix;
clouds position fix;
airplane physics fix.

1.4

easy mode;
inverted controls;
bufixes.

1.3

ballon cleanups;
smoke cleanup.

1.2

fix in safe points;
fix in landing.

1.1

clouds shapes fix;
night horizon fix.