Your question has been downvoted and may not end up surviving, but I think it's actually a valid question to raise.
As discussed by others in the comments below your question, the issue here is one of poor choices of formatting or sentence structure, which makes it much more difficult to see the intended reading.
YouTube doesn't allow for italics in the headings/titles over its videos, which means one cannot italicize the game's title. With italics, it becomes somewhat clearer:
Getting Over It's IMPOSSIBLE PHYSICS
It might have been clearer if the person titling the video had resorted to quotes or perhaps re-wording the title to make the game's title more distinct in the absence of italics, e.g.:
THE IMPOSSIBLE PHYSICS OF Getting Over It
In short, though, I would say that I think the "'s" the author chose to use is indeed correct, but they really should have taken steps to make their intentions much clearer.