The game is fast first person platformer. A fresh new adaptation of true and tried platforming. Rather than moving slowly and timing the jump from the edge. Speed is what counts here. You need to be moving at a constant speed to kick open doors, catch a drop wire etc. etc. Every thing is setup for constant nonstop movement. The level designs are so perfect; once you get hang of controls there is no need to stop. The game takes you through roof tops, A/C vents, malls, office walk ways and lots of other varied setups. At every stage there are multiple paths to move forward. There is a lot of freedom and it is tied well with risks.
A critical thing to understand here is that the start-up period of the game is ROUGH. You are expected to be able to wall-jump, balance on thin rails, jump over chasms, and do other challenging things. The controls are going to be hard to get used to. Don't give up. It could be frustrating. Stick at it, and give yourself time to get used to those controls. Keep working through the initial levels. The reward is well worth it.
Once you become used to the controls, the game really becomes captivating. You're expected to race top speed through a variety of obstacle courses. You have to think on the fly, react instantly, and pay attention to clues. It draws your mind in to focus on the moment.
You can replay levels to try different paths, to try to get a better speed, and simply to have fun. So even if you "solve" a level in one way, there are reasons to go back and replay them multiple times.
This game has been agony and ecstasy for me, and when I beat it I felt exhilarated. If you are a high-energy gamer who has the patience to try and try again, you will find yourself rewarded. If not, you should know ahead of time that there's no cathartic blasting your way out of trouble in this game.