Tried the demo, and I have to say the combat is indeed badass.
Trouble is, I am having difficulties with all the "jumping/wall running to the next level" parts. I just can't seem to pull it off. Frustrating. Any general tips for someone who has not played these types of games very much?
I'd have bought it already if not for the damn jumping/wall running issues.
NG platforming isn't that hard. Just pick a jump point and adjust it accordingly. The control and movement is fixed. Don't try it randomly, it'll only lead to frustration.
If you want to see some difficult ninja platforming, try PS2 Shinobi.