There's no way to do that without the ending, except if you use an episode file.

You could just tell the player to ignore the ending video.

Anyways, there's yet another bug. Right after the place I got stuck in there are masked tiles in layer 4 which should be in layer 5 I think.

Also, I think you should make the tube taking you out of the room with the other tiles, it was harder to find it that way.