Angels in the Sky, the first game to utilise Unreal Engine 4 on iOS, hit the App Store last week.

It's basically a gallery shooter with swish visuals. You float through an alien landscape using a pair of sci-fi cannons to blast waves of oncoming enemies. 

There's not much to it beyond that. You can't steer your craft or even pick your targets. You just hammer the fire buttons and hope to survive the oncoming horde.

However, though the gameplay itself is less than noteworthy, we felt obliged to put Epic's shiny new game engine under the microscope, and see whether it makes the iPhone 5S - the only device Angels in the Sky is compatible with - sing.

Here are the results: