The one major flaw is that having to hit 3 buttons on a keyboard at once screws up the computer and doesn't work on my computer. The third button doesnt register and I wind up not turning and dying. Which since thats the whole point of the game its unplayable in the later levels.
Make the ship jump points not glitchy. I get right next to it and jump towards them from the side and still hitting pavement half of the time. Needs bigger hit box.
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Do you freeze after a tutorial popup appears? Just don't hold the direction key down during popup, it should be OK.