Almost to the full release of the game..Would there be a demo on Steam for this..? I would love to try it and see if it's good or not..

Judging by the gameplay and after looking at the gameplay video, it is not really comparable to Mirror's Edge..It's probably the futuristic environment that looks really like in Mirror's Edge game..
The game kind of mix between Uncharted (or Tomb Raider if you don't play Uncharted) with Batman Arkham series combat style..
Unlike Tomb Raider, this game seems pretty linear; just keep moving from point A to point B..Not much freedom to explore the place and once you progress in the place, you can't go back to explore some more..