FeralHeart works for Windows 8. c: I have a Windows 8, myself, and really, there doesn't seem to be any difference for me. I have a laptop, as I have to travel a lot, but still, it really shouldn't make a difference. As long as you download the correct download, which should be the "FeralHeart Game Setup". It'll install the installer and then you install from there. xD
I believe other downloads should work aswell, Maps, Mods, other sturf. If you have any other problems, feel free to PM me. c: