Tower Shortage

So... Tower Shortage? Tower defense games. You sit around for a few minutes, build your epic death machine of doom, and then sit there and do nothing as enemies get shredded before even entering the screen.So what if you had one single turret to work with instead? Sounds impossible at first, but if you put that turret on a stand (haha, get it, "last stand") and carry it around, things get differe…