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A good concept but a bit lacking in execution. Whereas the concept garners a 5/5, the execution is only a 3/5 at best. I feel like the fact that all of the enemies are just mobs and have no AI (I feel it'd be better if there was some sort of enemy that actively tracked the ship and tried to kill it). Also, not reseting the fuel as previously stated, just makes redoing levels more frustrating and not particularly any more difficult or fun. I feel like there's also really no puzzle element to this game as all of the routes are fairly obvious at least and at most, a couple attempts at trial and error can blast you through to the solution. 4/5 overall but could have been 5/5 with a few improvements.
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two things; first off, hakkoun is right; not resetting fuel does nothing but force someone to restart the level every time they fail. Second, all rocket speeds take up the same amount of fuel for some reason. That...doesn't seem to make any sense. This would be a fairly good idea if you just made it more purely a puzzle game and focused more on route efficiency and whatnot rather than trying to shove other elements in there where they really don't belong.
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Why not reset the fuel after a failed launch? If I want 3 stars I just memorise the route and restart as often as I need. This just takes more unnecessary and annoying work from the player.