Even on casual difficulty, your fuel burns out in seconds because there's like no stars to collect. You end up burning through all your fuel going halfway around the planet just to find one.
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Hey testzero - thanks so much for playing, but I would like to offer a correction. On casual difficulty, you have enough fuel to circle the planet 5 and a half times without collecting any stars or utilizing the grazing mechanic to gain fuel. It sounds like you were accidentally cloaking yourself by holding W or Up - this mechanic causes you to drain fuel rapidly in exchange for giving you invulnerability. If you decide to give it another go, you can use Space or Left Click to move upward instead, and you'll have plenty of fuel!
Even after explaining, it doesn't seem particularly intuitive. it still seemed like cloaking was also providing upward thrust, or it's just not providing decent feedback for exactly what's going on. I'd suggest adding a forcefield graphic or something around the player when cloaked.
It just seems counterintuitive that "up" does not cause the player to move "up"