This is a great shoot-em up for folk like me who don't want to be shooting people. Fast-moving targets and (sometimes over)busy backgrounds make for a challenge.
My only complaint would be those backgrounds - those with 20-20 vision will be fine, but those of us who are a bit older might find it a bit trying with some of the smaller targets.
That said if it weren't a challenge then it wouldn't get such a high-rating.
And the Nerf-Gun supplied is a great toy in itself.