It's Geometry Wars, surely you recognize the art style from somewhere (even if you haven't played Geometry Wars before). The iPad version is similar to "GW: Retro Evolved 2? on XBLA. Visually, the game is a gorgeous experience on the iPad's larger screen, complete with particle effects everywhere you turn.
"As a port to Apple’s i-devices, Geometry Wars: Touch is a great addition to anyone’s portable game library. The only hardship is the controls take a long time to get used to, but as we’ve found in our testing and just by looking at the leaderboards, it can be done. And for the price, Geometry Wars: Touch is easily a best buy. "
hmm...I'd be tempted to buy it had I not already outplayed it on the 360 and DS :X.
Finger Gaming: Those who’ve played Geometry Wars proper will likely find the controls insufferable, but what if you happen to be that other guy – you know, the guy who denies there’s anything wrong with the iPhone’s control mechanisms no matter how bad they can be.
AppSpy: Plenty of other developers have taken a crack at trying to recapture the magic of Geometry Wars and some have certainly come close, but nothing quite manages to come close as the real thing.