I had the same problem. It`s a resolution problem. My resolution was 1920x1080 with Intel HDGraphics 4600. When the game has startet, the curser goes down to the floor. And you can only turn arround. But the problem appears NOT in 640x480, 800x600 and in 1280x720. This Resolution (1280x720x32bit) has a good quality on my 32"-monitor. The quality is not worse than 1920x1080. I use the GOTY.exe without any fixes. Intel HD Graphics 4600, Core i5 and win10 x64.