Thanks for playing! Yes, getting into the elevator and waiting forever is the end of this game. It's a callback to the previous elevator game that I made, which was a joke about "what if the elevator loading screens in games like mass effect were the entire game?" Getting stuck is kind of sad though, you're right.
As for making 3D bitsy games, you can use Bitsy 3D or Bitsy Color 3D. Bitsy 3D has the color limitations of standard bitsy, and Color 3D has access to more colors and a few other useful tools.