http://store.steampowered.com/app/24500/

About the Game

Dreamkiller is a shooter that takes players inside the world of dark and twisted nightmares. Gamers take on the role of Alice Drake, a psychologist with the extraordinary ability to enter the minds of her patients and combat the ravenous foes haunting their dreams. Utilizing a host of fantastic weapons and her own special abilities, Alice confronts our common demons only to discover an even deeper menace reigns within. The ultimate showdown becomes inevitable between that which would torment and she who will protect, and only one force will prevail amidst a variety of dreamscapes as varied and bizarre as the human mind itself.

The world of dreams and nightmares allows for each level to be a completely different environment with different sets of enemies
In each dream world players can enter a secondary level of the subconscious – a world within a world – and encounter new enemies, weapons and power-ups
Players can use Alice's teleportation powers to quickly zoom around rooms to dodge enemies and achieve a tactical advantage over enemies
Alice’s weapons are massive and fierce, each featuring two unique attacks and outlandish ammunition including lightning bolts, lasers, sticky grenades and even "Happy Thoughts."

System Requirements Minimum:

OS: Windows XP SP3, Windows Vista SP2, Windows 7 (Does not support Windows 95/98/ME/2000/NT)
Processor: 2.4 GHz Dual Core Processor (Intel Core 2 Duo or AMD Athlon X2)
Memory: XP – 1 GB RAM, Vista – 2 GB RAM
Graphics: 3D Hardware Accelerator Card Required – 100% DirectX 9.0c compatible 256 MB Video Memory with Shader 3.0 support | ATI: Radeon HD 2600 | Nvidia: Geforce 7600
DirectX®:
Hard Drive: 10.1 GB + 1 GB Swap File
Sound: DirectX 9.0c compatible sound card
Supported Video Cards:

ATI RADEON HD 2600
ATI RADEON HD 2900
ATI RADEON HD 3850
ATI RADEON HD 3870
ATI RADEON HD 4850
ATI RADEON HD 4870
NVIDIA GEFORCE 7600
NVIDIA GEFORCE 7800
NVIDIA GEFORCE 7900
NVIDIA GEFORCE 8600
NVIDIA GEFORCE 8800
NVIDIA GEFORCE 9600
NVIDIA GEFORCE 9800
NVIDIA GEFORCE 260
NVIDIA GEFORCE 280