I would initially say Bioshock, but that is ONLY because I am familiar with that series already. However, this game seems interesting as well, so I will probably end up getting both after renting and/or playing a demo if its available.
It kinda does remind me of Bioshock (as far as overall visual design and gameplay goes). I also see just a bit of Half-Life 2 (I think it's something to do with the environment, like the buildings and stuff). What do you guys think?