New levels are on their way to popular iOS architectural puzzler Monument Valley, according to developer ustwo.

The game, which Polygon's review described as "short and sweet ... like a dream I didn't want to forget" takes a few hours to complete and costs $3.99. It involves creating Escher-like pathways using building techniques.

"We are making some more levels, but the reasons we're doing it are artistic reasons," said designer Neil McFarland. "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. There are some other things we'd like to try."

No details have been released on the timing of the new levels or how they will fit in with the main story. "The only thing is we presented a complete story in the game, which we don't want to mess with, so what we don't really know yet is how we'll present new levels within that narrative," added McFarland. "We don't want to break it. But there are things we want to explore without destroying that experience

McFarland said ustwo is currently working on an Android version, and is considering other platforms. "We're looking at getting it on the PS Vita, and a lot of people ask about a PC version, but we're portrait and touchscreen, so it's not easy. We could do it, but it would be a bit crap," he said.