beta
At this point I'm beginning to theorize that all of them already reached the "ending" (but not the true ending) and escaped except for Bada because of a corrupt save "file"/tape maybe also probably caused by the prev Doha thus resetting and replaying from the start to their prev save points.
What I mean is... there's no auto save so they can't possibly "save" the ending, they would just leave/close the game obviously leaving the tapes behind. Thus The end. But the catch is one can't leave the game because of the "corrupt" file....and we got to remember that even if they escaped they only lose their memories they don't completely get out 'cuz there's still a player inside playing, so there's going to be a return player to help the player that didn't escape
The true ending would probably be to get paired/coupled up by twos with all of them surviving with "no one left behind" this might even be the title of the true ending.
Anyways it's just a guess and theory its not the story..I just really like to guess how the story could go (⌒▽⌒)