I was unable to play the game, moving the cursor only worked fine if the cursor wasn't captured so I was basically unable to turn the camera correctly :(
If only I could play
It's sorte of the opposite for me. When I left-click on the game window in the browser, the mouse disappears but I can't use the camera correctly: the sensitivity is HUGE (a pixel almost does a full turn) and I can't move the camera vertically. I might try again on my other PC, because the one I tried the game on has some issues with 3D games