Good game, but could use some improvements, for one a check point system could be a benefit to the game, as you do waste a lot of fuel at the start trying to get to the last point you were in the game to fight the Boss characters in the game.
I like you to can bypass the Boss's in the game and try to move on to the next part of the game, that was a good addition.
I know when fight the Boss's it had a bullet hell sort of feel to the mechanic, but the problem was that you burn a lot of fuel trying to avoid the fireballs. maybe next time you should place a reward into the game that allows the player to fill the fuel tanks once you defeat a boss or you repair the hull damage you might have taken in the fight.