I just finished this game yesterday- I can give some brief feedback.
The game is beautiful. Perhaps some of the best art design this generation, although the game could vary in level design as I'm tired of seeing the same grassy colors. The animations are fantastic, and sincerely bring life to two fictional characters.
The gameplay, well, it's tough to call it gameplay. With no difficulty choice, the game is scattered. For the majority of the game, the player barely inputs anything that wasn't going to already happen, which coincides with the story being quite linear. Ocassionally, it just feels like you're watching a movie. You can also never die in the game. Whenever falling off a platform or jumping the wrong way, Princess Elika reaches out an arm and the Prince grabs it, every, damn, time.
The combat is mediocre. Quick time events bail the player out if they are in danger, and provide no consequence for a mistake. Even if you miss the quick time event, the game will provide an animation which just shows the Prince getting beaten up. There are combos which you can alternate between the Prince and Princess Elika, which is fun. Combat appears so often, however, that the combos quickly become stale and flat.
The sound is phenomenal. The patters of the Prince's foot emanate beautifully and really make you feel like a badass as you're wall running. The background tunes fit the desert setting convincingly.
I'll edit this later when I have more time to write this *review*