Small note: The reason Jane doesn't straight up DIE in the sanatorium when it explodes is for a few reasons. Here they are:
1. Heavy plot armor
2. When Mike sacrifices himself in the lodge during some endings, the starting point is right next to him, and with Jane she was a good 8-10 feet away from the starting point.
3. (I have no idea about the science btw) Jane was blasted first, and the wendigo got hit a very short amount of time later, which led to the wendigo shielding Jane from most harm. Also the fire couldn't get to her when she was unconscious because the rubble protected her.
And onto my next thing.
Why did Jane not die in the fall?
1. Plot armor (less here)
2. Josh and Hannah both survived a fall like that (Hannah falling twice as far) with small injuries. Jane broke her leg, which was bad enough.
And finally!
How in gods name did Mike survive when in the game he did not survive with his injuries?
1. He was outside, which slowed down the process of him bleeding out.
2. Due to Jane existing, he had a much braver and protecting personality, which led him to fighting for his life in order to save the group, Jessica, and maybe Jane (If she is able to successfully survive the encounter with the wendigo(Which I might write to ease myself back into the fandom))
So that's some things cleared up. Still on hiatus, however.