The game is pretty fun. But I do think it would be better for the flame to be more obvious. I am not sure if it is intended, but when I hit the upper side wall and I don't think I am "landed" or near "landed", I couldn't turn or use the jet. I just find that part it weird.
Also I think the actual gameplay is a bit short and large amount of time is spent on navigating the UI. One idea could be continue with what fuel or health or even both to continue the next round. After all the fuel or health runs out, the game ends there and show the score sheet.
Overall, it is a pretty good game! Well done!