I'm usually a big fan of Drumond Park games, but this one I'm not so sure about. Each player pumps the arms until a bit zings off. If Ziggy says 'uh-oh' you lose. Simple as.
It's definitely lacking something. It might be that there are only 4 shooty-out bits so the tension doesn't build up quite enough before the 'uh-oh'. Maybe it's because if you're not paying complete attention you can miss what sound Ziggy made. Maybe it's because it shoots on every person's turn. The zinging is too common and therefore not a surprise when it happens, unlike, for example, something like Pop-Up Pirate.
That said, it's a quality toy and while we haven't played it a hundred times over, the children do keep picking it up just to shoot the zingers off (and then have a jolly time hunting round the room trying to find them again). I wouldn't rush out and buy Pumpazing, but I wouldn't start thinking up excuses if I was asked to play. It's just that it could have been a bit better.