I must say this game gave me a lot of fun!
I enjoyed the art style and Baron's quotes a lot. :D
I might be just doing it the bad way, but I think the fuel is used a bit too fast. I just press/hold the up key for a second or 2 and I'm out of fuel in a blink of an eye. Sometimes I have to use it all up to fly higher just a little.
It took me a while to realise how the movement works, even after reading that short info about ascending/descending.
On the 2nd level things are getting pretty tough. I can't make Baron fly further/higher. Also I didn't know I would lose the gold I put into upgrading special skills.