Thank you very much for your detailed feedback :) I am aware of the missing content and will start to iterate on the game this week. I actually never thought of putting an elevator in the level but am thinking to put one in now. The mission has only been finished for 1/3 so you did not miss a hidden clue the content was simply not programmed yet.
As for the collider bugs and incomplete movement, it will also be fixed very soon. Feels great that you saw potential in the game.