It's a very dialog heavy, role playing game where you play an alcoholic cop with amnesia after a particularly heavy night and have to solve a murder and work out who you are in the process.
A role playing game in the true sense of the word. Probably the most eclectic and varied skill system in any game I've ever played. Your choices actually shape the characters psyche and how you interact with people. It's pretty hard to describe as there's not much around like it.
The only advice I'll give you is that there are a lot of checks based on your skills (from speech and various interactions with the world) in the form of dice rolls.
Don't save and reload if you fail any, you aren't supposed to pass them all, infact your character is supposed to be a monumental f*** up and the game shapes itself to fit all outcomes. So no matter what the outcome of any encounters you have in the world, just roll with it, the game is at its best when things get chaotic.
I'm planning another playthrough when the update lands on the 30th myself. Enjoy!