This is good stuff. The object is to join your companion, whom you can switch to by pressing 'X'. You need to think in 3 dimensions, since you can end up walking on all faces of the cubes, depending on ramps to get there. All puzzle solving, nothing too taxing on the dozen or so trial (intro) levels. It's all very cutesy, with a Nintendo-like vibe that includes gibberish accompanied by text balloons.
Edit:
A review. These are slow to trickle in, I'm sure in part because the game is not "officially" released. (Really, it is, officially, just poorly "hidden" for hype/marketing.) It seems to be a winner from what I've experienced and read so far. Metacritic has nothing on it yet (probably because it's a "future" game).