This is the most fun I've had with a game in a long time. The combat is really satisfying with the sword and the other weapons become pretty crazy as soon as you start upgrading them. I was kind of expecting a nostalgia cash in and this is simply not that.
It is it's own fully fleshed out, highly polished, 12ish hour long, single-player game and a damn good one at that. A lot of people are complaining about the price, I'm really not sure when all of this became worth less than the $36 they're asking for.