Its hard, fun and frenetic. The enemies are real challenges and it´s gameplay is unique, the music is also appropiated and good, but I must say that there are a lot of unnescesary flashing scenes just in your face. After a short playtime session you may found yourse visually tired.
Pros:
+ Fun and responsive game play
+ Creative FPS with hack & slash mechanics
+ Viseral and hard combat. (You need to know the enemies to beat them)
+ Good music
+ Art style is a blend between fantasy and SCI Fi that works
+ Low price, excelent product.
Cons:
+ Extreme use of flashing lights while playing and in cutscenes. They may make you feel sick.. (Thats my case while writting this review)
You should try this game, is what a FPS should be. And for the price worth it.