Very nice concept and decent execution, the controls don't feel like I have control, even after I got used to it I still found myself frustrated while trying to maneuver around the map, I think if there's a separate button for slowing down time (Maybe RMB) rather than A and D, would be better I believe.
Even though I didn't feel in control of the gun so much, it was still very fun to play and very challenging, I almost got to wave 3 but I kept bouncing around for the final enemy and ran out of bullets.