An actual playable game!

TL;DR: win conditions, score, better network stuff meaning faster loading

While there is still much to improve here, you can now win (with a
score) and lose! The current level that exists has a goal of “make the
orbit more circular.” Here are all the possible scenarios right now:

• Drifting off into space, never to return!
• Crashing into Earth!

Both of these already existed but now there’s a limited number of burns
(currently 2) and when you run out you will see one of these three
things happen:

• Mission complete! This shows your score between 0 and 1000, with the
  latter meaning you got your orbit to be perfectly circular.
• The orbit became less circular
• The orbit didn’t change

All of these are possible now and the game can detect each one, and so
you can now actually play the game and get scores! In addition to win
detection, I optimized the network transfer of data so it doesn’t resend
all of the position information over the internet every time, just the
new stuff. This makes the game faster.

If you’d like, you can try the game yourself now at https://burn.jmeow.net!