Game plays great, looks great, sounds great.
My main issue with it has to be the extreme difficulty which by itself isn't a huge issue; I did find after a few tries I was sort of getting the hang of it. The problem is twofold:
1) No checkpoints. Having the difficulty be this extreme in combination with having to start again from the beginning felt absolutely awful. Having checkpoints would mean I'd get to trial and error the same part of the game over and over, without feeling like I'm losing too much time for daring to experiment or have that dread when I lose most of my fuel just attempting to take off at all!
2) Having to manually restart when you run out of fuel. This might need to be carefully implemented (afterall, 0 fuel doesn't mean your momentum wouldn't carry you to the goal) but it feels kinda rough having the game just sorta stalemate when it's impossible to do anything.
Apologies if the suggestions sound harsh. To re-iterate, I really liked how the game felt to play and the feeling of getting the hang of a good approach to get to a goal feels great in light of the difficulty. The difficulty isn't the issue imo, it's how the difficulty clashes with other design choices I feel.