It is somewhat fun. In my opinion death comes too quickly. I don't mind a challenge, but for a game to be truely engaging I have to be able to live for more than 30 seconds. Decrease shrink speed in the early levels plzthx.
Park on the right edge of your platform, as soon as he shoots missiles at you, press right and pop his window on the way up. Once you have some good air from his bombs, circle around them and bounce off your platform at his window again. you should meet the bombs that were chasing you just after you hit his window and get a ton of air again... rinse, repeat, win, have a donut.
Once you figure out how to beat the last boss, it's not luck based at all. I just beat him 5 times in a row to verify that it's repeatable. each time I'm finishing with more than half of my fuel, so TONS of room to make mistakes here and there and still beat him.