My impressions after completing the main story and doing all of the side content
God dammit this game is great.
But for me personally it didn't happen until the 8th hour. I had a combat encounter with a large herd of enemies, and everything clicked. I finally got the game. Up until that point I "got the game", I moved around, shot things and did what the game asked me to. But after those hours I had a revelatory moment, it was this weird Metrix Neo moment, where I suddenly started seeing movement opportunities everywhere, saw how I could use the world around me to do more damage faster then ever before.
I started to move much more controlled and calmly during combat scenarios, and I felt like I finally understood what game Insoniac had made. Which is probably also why they didn't release a demo, because it takes a much larger time investment to appriciate the game. It's closer to things like Spelunky and the Souls games in that way, you have to invest a lot of time to understand the game, how it works and then everything just suddenly clicks and you get it. And then the game becomes something entirely different.
So I really liked the game. It takes some time getting to understand what type of game it actually is, but when it really clicks it works. The combat is good, there's a ton of weapons and room enough to find a set of eight that really work with your play style, combined with the different amps (which is my only negative point towards the game, it feels undercooked to me. Needed more amps and perhaps a seperate levelling up system).
Game length: I know a bunch of people really care about this, and the game is around 15 hours if you blast through and really focus on nothing but the main stuff. Which would be sad, since the side content is really well done (especially the entire mission dedicated to poke fun at focus tests and probably also Overstrike).
Framerate - Super stable, I only had it dip once in my 25 hours with hour with the game which is fine for me. Cutscene animations are a tiny bit lackluster, but everything else shines. There's a surprisingly large amount of diversity in the environments, and points to Insomniac for holding a lot of stuff back for the game.