Nice work! Had to turn the light on in my house, play in windowed with the volume all the way down just to get through it!
A VR port of this would be awesome, right level of interactions nice visuals to look at. Would be terrifying.
I noticed your lights popping a little. I noticed that same thing in our unity webGL build, so you may be able to fix it pretty easy. Go Project Settings > Quality and in the top table thing, select 'High Fidelity' for the WebGL column.