Audital, now out on iOS, is tricky but ambient.

It's a concentric arcade game about managing the incoming traffic of circles and shapes. That's the hard bit.

While you do this, dynamically generated audio by Simon Hale, who won a BAFTA for his work on LA Noire, keeps you relatively chilled out.

Your goal is to safeguard a circle in the centre of the screen.

You do this by rotating a circular wall around that circle so that only the squares reach it. If one of the dark circles hits your big, central one then it reduces in size.

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There are many nuances to this play. If a square hits your wall then you lose the chunk it hits, whereas circles bounce off it.

Sometimes, a square will cause another temporary wall to grow outside of your first one.

Audital is pretty, both visually and audibly, that's for sure. How long it will keep you entertained, I don't know, but its central conceit is at least challenging.

If you fancy giving it a go, it'll cost your £2.29 / $2.99 on the App Store.