I found a few threads from before the game was released saying that the devs were planning on adding touch screen controls for windows tablets. I haven't been able to find any more recent information about whether touch support was added. I will buy it right away if the touch controls are comparable to the ios version, but I won't buy it if I'm going to be tied down to a desk when I want to play it.
I waited forever for the Android version and resisted buying the PC version because I wanted a portable experience like on ios, and I wanted to support Android gaming. Now that I have a windows tablet as well, if the experience will be similar then I'll go for the windows version. Thanks