Pacing is really nice for the project, you've got the level design flow down to a tee. Only thing I would say that was misleading was the objective - Since you have a fuel gauge at one side of the screen, I assumed I had a limited resource that only refilled when the pickup was collected (Rather than it being the resource to unlock the ship). Making it something different like a piece of the ship, an artefact, coordinates would've reduced early confusion in game. Great work.