Can't give a rating for this because it isn't working for me, I got to this point but can't figure out how to progress. Clicking 'rescan' makes a noise but clicking 'star map' doesn't seem to do anything.
A couple of nitpicks from what I did see; the opening cutscene is well implemented it but it's still worth adding a way to skip it incase someone has to reload the page (or is just impatient). I also noticed when the earth is rotating that it's a square sprite with black corners, not a big issue but it's noticeable when the corners pass over the stars, you should be able to set a transparent background when you're making the sprites to avoid this.