I believe Raetikon is completely 2D, but stylistically I'd say it's an analogous 2D style to the specific modern 3D low poly style discussed in this topic. It's a trend that's been going on for a few years now, from logo and web design to motion graphics and various user interfaces. I think it all blends into a similar sharp and colorful look.
I see, well whatever style it is I certainly would like to see more games use it.
Also love the style of The Deer God
But I think that's something different again.