I love the idea of this, but there's something weird with the mouse tracking - the view just drifts to point at the ceiling unless I constantly move my mouse down. (0n0w does the same thing). Kind of kills the relaxing vibe! :-)
Thanks for trying it out! Oh this is a weird bug with Unity if you have a controller plugged in or some sort of controller emulator, sometimes even midi devices can trigger it, so unplugging the different devices might solve it! Working on a patch on my end to workaround this problem, but no eta yet :)