Do this trick if you want to beat the game easily: First, get the max rocket and max fuel refuel. Then, after your launch, repeatedly press up. You do not have to do it as fast as you can, there's a rhythm to it. Basically, you'll want to keep the height meter at about 2/3. You can maintain your height this way without using much fuel. It also makes it easy to navigate towards fuel refills and away from the flying guards. Just adjust your tempo.
 "Go Go Goblin 2"){kind=icon}
 "Last Legacy: Null Space"){kind=icon}