New build is up! Links at the right have been updated to the 9/30 build. 
The main two changes in this build are Demon now running on Unity 2017 (instead of Unity 5), and what I hope is a significantly improved experience with full screen mode, particularly on Linux systems. Many thanks to Tchey for his help in testing solutions to the full screen issues, since I do not have a Linux system of my own I could test them on.
Other than that, the build includes a few bug fixes to abilities added in the previous build (most especially the Execute ability and its cousins), as well as a new hotkey for swapping abilities (the z key) that should be more friendly for non-QWERTY keyboards.
As previously stated, I will have to drop back to bug fix only / slower forum response times for a bit due to work here coming up, but it will only be for a couple of weeks. After that, it will be time to get back to Fun Stuff. 
Cheers, and good luck in the Tower!
Oh man I thought this was going to fix the blurry fullscreen thing :(.
Wait, what? It didn’t?
Sent you an e-mail, we’ll get this fixed. 
Oh, whew. Looks like it was just a hotkey mishmash. Windows lets you fullscreen any program using Alt+Enter… but if you use that for Demon instead of Demon’s official F11 key, you will run into issues.
I need to try to find a way to prevent that, or at least warn people not to do it once they’ve done.