Highscores for the daily (and yesterdaily to check where you ended up) would be nice.
On mobile it shows controls in lower left/right corners, which is a little inconvenient. Luckily, touching anywhere on the left/right side of the screen works.
Possibility to zoom out would be nice, to avoid the possibility to fly into a dead end.
Also, I'm somewhat confused. This is HN and noone has yet posted some js that calculates/plays automatically? Iirc that was the case for the NASA docking simulator. Or did I dream this up?