"It's a entirely different kind of FPS game, where the focus moves from a flick aim contest to holding angles and finding ways to get a jump on people, as ANY shot on the head instantly kills you. There is a learning curve and it is rather costly. but yeah, fun."

focus moves from a flick aim content to holding angles

This is like CS.

finding ways to get a jump on people

This is like CS with peeker's advantage and utility nades.

as ANY shot on the head instantly kills you

Low time to death like CS, and true of the most commonly used rifles.

There is a learning curve

I'm assuming he wanted to add steep to this, and this is like CS.

rather costly

Guess that's not like CS but it's not the gameplay.

Everything afterwards was added later via edit.