Nice, glad it worked! The demo might have worked because we used an older version of the Unity engine to build it (upgrading fixed some memory leaks that were affecting a ton of people). In general, the main reason to not allow free resizing is because we didn't design the UI to accommodate for all aspect ratios (or really anything other than 16:9).
The "keyboard only" setting lets you control the artifact in-game using only your keyboard (and not your mouse). It's helpful if you want to play on your laptop in bed or something like that I've heard.