Surprised that you never played Shadow of the Ninja before. It's definitely my favorite pre-Tenchu ninja game, perhaps only closely rivaled by the GBA's Ninja 5-0. However, the co-op gameplay in Shadow of the Ninja more than makes up for it.
The hack looks interesting. I especially like the seemingly custom art for the cutscenes, etc.
However, grammatical mistakes really kill a lot of hacks for me, and when there are mistakes in the preview screenshots, such as the lack of list comma(s) in the first screenshot on its entry page, then there are probably more within.