Just watched the trailer - and it looks excellent! You've really managed to evoke a great atmosphere. I can't wait to play this and see my "twisted plot" in the flesh! (Or polygons.)
Quote: "The only problem I have is that it looks like a fpsc game, one needs to either give it a stylised look"
I guess this is a problem with FPSC: many games made with it look like they've been made in it. Even Legacy of Cthulhu (that commercial one) looked quite boxy. But I think smallfish managed to create a lovely steampunk mood within the confines of FPSC. Also, I know what you're saying about making it stylised - if the textures were all cartoonish or greyscale or psychedelic it would certainly look original - but I think the Steampunk city look is a style in itself
As for the falling through floor problem - I'm not as familiar as you are with FPSC so I'm not the best person to be giving advice, but maybe you could start the player a few feet higher? So they fall onto the floor and, hopefully, not through it. Or maybe you could put a box or a carpet underneath them. Crude, but if it works it might be worth it, I guess.
I'm not actually a Kiwi, I just randomly thought it up one day.