First person survival horror on your DS is a nice attempt, but a clunky control scheme hinders it down.
Something terrible has happened and you wake up in a mental institution. Supposedly there's been a mutiny or something, since there seems to be no one around. It's now up to you to start exploring and trying to stay alive. Story is very typical in this genre of games, but on a hand-held it's not so common. Story is told through text and in-game cutscenes: it works quite well.
Graphics are about the same quality as in Metroid Prime: Hunters, which is to say functional 3D environments. But since the game takes place in a mental institution almost everything looks grey and dark. Sound design has seen some effort in creating a scary mood and in a way it succeeds to do just that. It's very advisable to play Dementium with headphones on.
Controls are slow and clunky, but that's not a problem as long as you're doing the best aspect in this game: exploring. It's fun and interesting to just look around and find some old newspapers and wall writings while listening the different sound effects and music. Unfortunately combat is a big part of Dementium and this is where the fun stops. Control scheme is not suitable for fast-paced first person combat and it's just frustrating.
In summary Dementium is a nice effort to bring survival horror to a hand-held gaming console, but they should have focused on the exploring aspect or change the control scheme to something similar as in Metroid Prime: Hunters.