Damn, a lot can definitely go wrong, creepy vibe!
Looks like it's not optimized to be run in the browser though, the sensitivity is super high (& doesn't seem to be dependent on my mouse's sensitivity but it was really nice for that to be customizable in the options!) and if my mouse hit the edge of the screen, it either went to the next screen or couldn't move anymore which means no movement, the cursor would probably need to be locked to the center of your screen, every engine should probably support that