Just played it - it was about 20 minutes long for me. The last scene is right after an explosion blast coming from the narrow corridor; camera is flying towards the large hole in the ground, meanwhile protagonists are discussing reasons and culprits behind this possible diversion.

forgot to update, but i figured out the problem. for some reason it sometimes saves right before the ending section so you have to completely restart to get the full demo again

Does the lockpick thing work for you guys?? I tried it, but the A and D keys didnt work at all for me