Another good shooter from Renegade Kid. It's good fun, but it's not revolutionary for the DS.
My other problem is with the game's shotgun. By that, I mean there isn't one--not a real one at least. There's an alien-weapon equivalent, but it doesn't really give the same ooomf that a shotgun sound is supposed to give. When you fire a shotgun in Doom, Duke Nukem 3D, or Halo you KNOW it's a shotgun. There's a huge pow and recoil and guts fly everywhere like God intended. Sadly, in this, it's like a pellet gun.
Needless to say, the game itself is pretty well done. The problem of a lack of variety in enemies is beaten by the fact that Moon is actually a pretty good game. It has solid shooter elements, the driving portions don't feel too forced, and the attempt at horror is pretty well done for a DS game. Coming from Renegade kid, it's nice to see a game that doesn't need the M Rating to be creepy.
In the end, Moon is a very solid shooter. If it's on sale for less than $10, it's a steal, so I'd recommend grabbing it.