Hi Newgames re:
Please help if there is a save game file and how to use it.
Unfortunately there are no save games as such, the only save available is the one when you quit the game.
I played this game and I got stuck like you a couple of times, I do not remember if it is the same place as you, on one occasion I tried Windowed mode and that helped, on the other occasion that did not help but going into Graphic options and lowering All the Specs. ex: Texture from High to Low, Shadows from On to Off, etc.
Don't know if this really helped or it was my mad mouse clicking everywhere that worked, but it did work, guess I was lucky.
Good luck with your game.