Summary: more like C.R.A.P.. SP Campaign is very short and very bland, You could probably beat the game in less than an hour. Music is repeditive, level design is basic and AI is just stupid. It calls itself a "classic shooter" but It would be a spec of dust compared to the greatness of Doom or Quake, Which, if you have an R4, Acekard or other Homebrew running slot 1 cartridge along with the original disks for the games, you can get unofficial DS ports of both.
Summary: So, I saw this game was a first person shooter, and I thought it would be pretty cool. Then I got the game. I was horribly disapointed, the graphics are last-gen, the gameplay was okay, not anywhere close to clean cut, the hit detection was pretty iffy, and the weapons were dull. Boss fights were a joke and level design was astoundingly boring. Don't waste your time or money.