It's supposed to be that way!
People, the cursor is slow because your starting gun is heavy, if you look at the gun stats in the shop you'll notice thier weight is listed, the lighter the gun, the faster the cursor will go.
Good game for a 5 minute break, would become a great game if minigames where tweaked a bit and the entire thing was expanded and made bigger, including more items and weapons, as well as an ability to replay matches you already won with your new advanced equipment, that would offer some more replayability to the game rather then just fighting the Zombie over and over again.
At the very least a level 6 gun for us to try to get would help, as well as more depth to the ammunition, like if there really where windy days so we have a reason to use those iron bullets rather than us just getting explosive shells all the time.