Particles normally make effects in a game pop, so it shouldn't be surprising that a game compromised entirely of particles also looks striking.
Check out A Light In Chorus — a game that looks promising, despite being so early in development:
The minds behind the game, Eliott Johnson and Matthew Warshaw, have an interview over at Eurogamer that makes the puzzle-oriented PC game sound fascinating too:
Allowing our entire game world to be constructed of particles offers us an enormous amount of potential gameplay mechanics which we're constantly exploring. One of the ideas that's most exciting to us is how this allows for objects in the game to exist in a multitude of states, and that the boundaries of what we might consider 'objects' become indefinite and flexible. A lot of the gameplay revolves around points being reorganised and reconstructed into different objects (this would be the thinky/puzzly side of things). Likewise narratively, we're interested in how this enables us to tell multiple overlapping stories, as opposed to a single grand narrative that you uncover incrementally.
This is to say, the game is more than just a pretty face. Neat.