Actually really neat and fun. I was surprised by how cool the design was because I didn't understand a lot of the game mechanics at first. I think there should maybe be some more visual or audio feedback when you refuel because it wasn't clear to me that that was even happening at first (I thought it was an item pickup and not something you get by being in an adjacent square). Then because the idea was so novel to me, it took me a bit to figure out that you were shooting fire fuel pellets and not an actual weapon of some kind. While the hudless idea of a colored fuel indicator light is neat, knowing exactly how much fuel you have left is kind of important, so having an actual number show up in the square instead of a color (which doesn't even distinguish between 9 and 8, 1 and 2, etc.) would be pretty helpful.
But the puzzles, especially some of the later ones, are pretty neat. There's a sharp increase in difficulty around level 7, but all the levels after that are just as difficult too. It does become a bit frustrating since the levels become kind of long and dying results in you having to repeat unrelated sections again, so some kind of save state, undo, or checkpoint system would help in this regard. Some of the levels do seem like they have red herring sections (most apparent in level 10, what's the point of the rightmost section?).
The presentation itself is a bit hampered by some of the spelling and grammar errors, and also by the fact that the music loop is like 3 seconds long and goes on forever, but the graphics themselves look pretty decent, and it plays fine.
It's relevance to the theme is pretty minimal though.