A great game reminiscent to old-school classics like Doom, Quake, and Half-Life.
The sound is just great. I couldn't hear any static like many games. It is even more impressive because you will here music, weapons, running, enemies, and much more. The only downside is that there is no voice acting as far as I know.
The controls work pretty well for the most part, since it is pretty much the same as other FPS games on the DS. (For Righties) Move with the D-Pad, shoot with Left Shoulder Button, and aim with the stylus. The thing that made the controls uncomfortable was the fact you crouch with the X or Y button and zoom with the Right Shoulder Button. It isn't too big of a deal, although it would've been easier to have those buttons be on the touch screen. BTW, there is no tutorial, but it isn't too hard to pick up.
The graphics are really well done. The faces are done in well, although the time you see your commander in the beginning isn't pretty. Effects and maps are well designed without repeating rooms. Another thing I noticed was the fact that the maps are designed to be a lot less linear. For example, in the beginning, you have to disable a security system. To do so, you can pick one of two entrances, one on the second floor and one on the first. Rooms are also decent sized and have many objects placed in them without lag.
I haven't gotten too far in the game, so I really can't say too much about the story, but there isn't a lot to work with from what they give you. A space rock hits Earth and a team goes to investigate when the station built on it goes silent. From there you start playing without knowing anything else. I'm assuming that you are supposed to piece together what's going on as you progress, but it would've been nicer to know at least a little.
All in all, the game is pretty good and is great if you like the classic shooters.