This is a pretty cool idea! I don't know if it was due to my crap laptop struggling to run it >.< or whether it was just somewhat wobbly in terms of camera, but whenever my laptop lagged and came back again, the camera angle had changed despite me not actually moving my mouse, which was quite disorientating and made it kinda hard to find stuff. I didn't get any motion sickness or anything like that though. If I was able to use my PC, then I'd try it again on there cos I like the concept :3 Sadly I just don't have the space to play stuff on my PC right now :(
The insanity thing is really cool! I love that sorta psychological element in games :D