I finished the game after 22 hours, and I enjoyed most of the time I had with the game. Here are some points that might help you decide if you want to get the game yourself:

PROS:
- The customization is AWESOME
- There are a lot of different weapons
- Fun gameplay, if you like fromSoftware games like Dark Souls etc.
- There are different endings -> replayability
- Everything sounds cool
- THIS GAME IS HARD, especially in the end

CONS:
- This game has a lot of unavoidable damage (some stray shoots will hit you even if you are a god at the game) which can get frustrating at times
- Some bosses have the Malenia sickness. Looks cool but the gameplay is unfair and annoying. There are a lot of attacks that are unavoidable if you stay to close and some don't have warnings, so you can't react to them.
- A lot of weapons are the same thing just in different sizes and shapes. (There are like 10 rocket launchers)
- The story is mediocre at best
- The game is NOT OPEN WORLD. The whole game will be played in a sequence of small missions
- THIS GAME IS HARD, especially in the end (if you don't like this kind of stuff)

TL;DR: 7/10 - I like this short game with nice gameplay, customization and annoying enemies :D