Somehow managed to kill Kioth while I was dying, which got my game in a bugged state, even after loading. I think the game also bugs if you load while the puzzle is open.
Is there any way to escape the planes after completing all the quests?
Nope... At the time, I wanted to make a final level on the moon as well as different enemies but it took me too much time and my game didn't interest anyone. :(
