Now that I think about it, I don't think we mentioned that the DMM version has a fully-functioning mobile version.
There are a few ways of getting ahold of it, but for me the easiest was by installing the DMM GAMES app on my mobile and downloading FKG through it.
The only thing I can think of that would be negative about the app is that it can start lagging really heavily in a longer run and needs to be restarted, but that's about it.