I'd get rid of the old logo too, but primarily because of how you can't properly read the catch-phrase and those colors don't quite match very nicely or perhaps it's the font? Not sure. By the way, a small trivial website inconsistency; it reads "Gota kill 'em all" (English version) and "Gotta kill 'em all" (German version). Might want to change that, but then again who'd notice it anyways.

I really like the pokemon phrase "rip-off", even if not on purpose, but you did use other popular things as well? Like Gothic City -> Gotham City, but I might be thinking this purely because I watched Batman today and I wouldn't change it. But to be honest your city doesn't quite look very Gothic to me, mainly because of the colorful cell shading?

Off course, a city doesn't have to look like it's name suggests.
(Lol, I would really like to know what this game would look like if made to look a bit more like Gotham City actually, when it comes to the color scheme. It would be rather original to have a cell-shaded game with a grayish blue (red) dark black color scheme (SIN CITY meets Gotham City?), but this colorful scheme is pretty cool too.)
Frankensteins Kreatur seems to miss the 'Frankenstein trademark' of those bolts in the neck area. Not sure if this is a bad thing, but again the name would suggest such a feature to be visible. I don't think you'd get into legal problems for that.
Personally I liked what I've seen so far and the demo you once had was pretty good (although back then you couldn't attack while walking which made it pretty hard). Good luck,
Cheers