I just updated Void Piercer to v1.01.

This version hopefully makes capturing the mouse more reliable so mouse look works fully from the start of a level and you don't need to click to recapture it.

It was likely that a click was required in v1.00 to capture the mouse but this wasn't obvious as the cursor was hidden. It may also have been confusing as the first click (left or right) would have captured the mouse and not activated the 'reverse' or 'overload' actions of the scanner.