The game is pretty cool so far, the music is amazing, the controls are tight enough and you never know what the fuck you're gonna see around the next corner. I also love the oldskool Ghosts 'n Goblins style setup, where you see the game map and your miniture character placed on it at the point you are. Also a very minor thing, but something I love: in the background of every stage you see a huge tower, which I'm assuming is the final level. That kind of stuff makes you remember what your goal is.
They're really pushing for a "road-movie"-type deal (even starting a new game is called "new road-movie") which harkens back to the days of the NES, just a very basic progression, which for me negates any problems I'd normally have with a game being linear. Here it feels more like a design choice rather than having to deal with technical limitations.
In the 2 hours I've played I did get the feeling it was getting a bit samey, even though the game throws a lot of new elements your way all the time. It does boil down to demons appearing and you shooting them. So far it works fine though, but I hope the environments themselves are gonna change soon, I'm now in act 3 and it still looks the same as act 2 (act 1 is just a short intro).
So far I'm definitely recommending it though, the game is pretty much fucked in the head, which is all too rare in games. Even if the gameplay itself is nothing new, the way it's presented is definitely worth the price of admission.
