iOS game Monument Valley has been a critical and commercial success since its release by developer ustwo in April. Now it has made the jump to Android.

The game was released today through Android's Google Play store with the same price – £2.49 – as the version for iPhone and iPad. Its release came as ustwo announced that the iOS game has sold 500,000 copies so far, in an interview with TechCrunch.

At £2.49, that means £1.24m of gross revenues on Apple's App Store in just over a month, with just over £871k going back to ustwo after Apple's 30% cut.

In an interview with The Guardian last month, ustwo director of games Neil McFarland said that Monument Valley had made back its development costs in the first week after its launch, indicating that it's well into profit now.

That's an encouraging sign for other developers making paid games, rather than adopting the dominant free-to-play (but funded by in-app purchases) model on Apple and Google's app stores.

"We’re not saying free-to-play is bullshit and we shouldn’t do it: with Whale Trail we have one of those games out there. But we want to make each game in the way that best suits that game, and Monument Valley wouldn’t have worked as free-to-play," McFarland told The Guardian.

He confirmed in that interview that an Android version of Monument Valley was already in development, smoothed along by the fact that the game was developed using the Unity software, which runs across the two platforms.

"On the whole, Unity does an great job of smoothing over Android device fragmentation. There were some fundamental issues that we needed to address to make sure we could run on all the Android GPU families, but compared to doing an Android port of a custom engine it’s been remarkably easy," technical director Peter Pashley tells TechCrunch.

"We’ve probably spent more time ensuring that the game experience is well tailored to Android devices, integrating Google Cloud Save, supporting Samsung S-Pen, etc."

ustwo has already confirmed that it is working on more levels for the iOS version of Monument Valley, to add to the 10 in the original game.

"We are making some more levels, but the reasons we’re doing it are artistic reasons: there are some ideas that we didn’t get to work so didn’t put in there, but which we’d like to see work," said McFarland.

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