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You get plenty here for your cash, and a two-player option saves even the poorest events.

You have to admire Cave's audacity. It's basically saying that here is the greatest shooter to grace iOS – and that if you want it, you're really going to have to pay for it.

It's the kind of thing you can lose hours to, but we never found ourselves excited or addicted.

And while the game looks pretty, it lacks the challenge of the similar LostPixels and the character of eBoy FixPix.

Yes, it's maybe just a little on the shallow side, and it has this annoying stash of red power-ups that you have to avoid because they leave you decidedly worse off for a while, oh, and it features boss battles, too. We honestly don't mind too much, though, because of the non-stop rocket action.

At its best, the game resembles a side-on Zen Bound, but the gradual introduction of arcade elements ends up being a frustration, since your finger too often obscures the action.

Super Crossfire eases you in gently - perhaps too gently, because most of the first 'chapter' of waves is a dull walkover. But subsequent chapters are more demanding, requiring quick thinking and rapid strategic adjustments. Additionally, the ferocious Dark mode and one of the finest power-up mechanisms we've seen ensures this game is one of the very best retro-oriented shoot 'em ups on the system.

If you're the sort of person who stares at your open fridge for hours trying to find the butter, only to realise that it's slap bang in front of your nose, then you won't get on well with Stray Souls, since you find most of your objects by spotting them in a very detailed scene.

It's challenging and entertaining, with courses that feel alive, and it has more than enough content to justify its price-tag.

It's a pleasing game of cat and mouse, but despite some extra web-slicing tools, does feel a bit one-note. It's damn tricky, too – an early wrong move will leave you scuppered in a checkmate scenario. We told you they were evil.