Congratulations!
Thank you very much for the informative gameplay explanation!
I am big dwarf fortress fan and the world view follows the same mechanics so I have wrongly assumed people will already be familiar the view mechanics as I am : (
Yea the dragon ai has trouble wrapping through the edges of the map because it will take the closest possible one of its choosable locations, and due to the dragons special movement style it will basically pivot on the spot and try to race back to you. The Dragon IS Killable, and you get a special shoutout in the end screen if you do kill the dragon and escape but it is pretty hard. If you escape with the egg you should now have the Dragon as a flyable mount! Once you fly the dragon you can see why it's so hard to kill, and what it would take to kill it.
Thanks very much for showing so much interest in this little experiment!