Rez is a unique gaming experince that delivers more on concept than on depth of gameplay, but is a must-try game.
To catch up anybody who has not heard of it, Rez is basically the result of a 3D rail shooter and a rhythm game having a baby. Anyway, when I got into the first level I was in awe. Basically everything that happens in that game happens in time to the beat. However, this managed to not distract from the gameplay somehow. It is quite an experience. However, it still lives too much in the realm of experiment to be a great "game". There are only four songs, and they all sound similar, and the differences in the appearance of the levels is minor. That being said, the design of the bosses is great. The third boss (the cylinder of rotating laser tiles) is terrific. The bosses are what the StarFox bosses never really flushed out.
Those that are looking for a the typical "game experience" would probably find it a little crude. It is definitely not in the same league as an Ikaruga. However, my musical background had me wanting a bit more flexibility in terms of the musical aspect of it. You are pretty constrained in the sounds that you can contribute to the music, and it is a little difficult to get things to sound like what you want them to. It adds some excitement because you never know what is going to come out, but it makes me want to play it a little less over time. That being said, the game does strike a decent balance of the game and the music and will likely not turn off someone more interested in one than the other.
The final word is that it was an enjoyable (though short)experience. It seems to me like the difficult part (getting all the rhythm working, etc.) was done well but they skimped on the easy part (more levels, or a diversity of music). I recommend it to anybody with an interest in games with a different slant. It works wonders on an open mind (at least for a few hours).