Much harder than expected.
The graphics look cell-shaded and they are great. A big step up from most of the other games. I know, the other games are usually faithful recreations of old crappy games, and that's true, but this is not and it's good.
This is the first game that I've bought that I really don't know if I can finish and get a good number of achievments. It's not looking good for me so far. Regardless, it is a good game and is worth the purchase price. Take a chance and go get it.