The lack of audio made things feel quite eerie on the whole, and while you might not have intended to have complete silence throughout the game, it does fit somewhat with the grey, misty atmosphere - maybe there would be something in a minimalistic approach to sound if you take this further! The way the story progressed as you climbed up the building gave it a very clear and literal direction, and it feels like the start of a dystopian sort of world which could potentially be quite engaging. As others have said, the movement feels awkward, but at the same time I don't think I've played anything with quite these movement mechanics, so perhaps refining them and neatening them up while keeping their uniqueness would be a good shout.