Are there any plans for a Linux version?
Not currently. I've heard that it works with Wine, but I have a way of testing it.
I bought it and it's basically unplayable for me. The graphics are all blurry and making the window smaller doesn't even help. There's no options whatsoever. No fullscreen mode. No redefinable controls. Unless I'm missing something?
F4 will put the game into fullscreen, but no, there are no redefinable controls.
As far as the blurry screen problem, I haven't found the cause of it. It only happens for some users, and it seems like it is a forced anti-aliasing problem on some graphics cards. I'm still looking into it, and if I figure it out, you should be able to just redownload the latest version.