I think it might be possible to help with the aiming by including an on-screen radar so the player has an easier time figuring out how much to turn, and it would definitely be more encouraging if the enemies dropped ammo or health. I think the fuel, as it is right now, is definitely enough for the size of the map, but making enemies drop fuel on an even larger map where the player doesn't have enough fuel to get to the end without getting some drops would guarantee engagement.