Very fun. Up-to-par terrain mixed with a unique gaming experience leads to an enjoyable game. However, they're are a queries that I'd like to mention:
Although the open-endedness is nice, it could use a few more built-in events. Even the enemies shouting "Die!" or something of the like would spruce it up a bit.
While I see you have imported quite a few models, the repetetiveness of the Shadow Heart ninjas got on my nerves after a while... They were all the same with the exeption of the Commanders and the War God. I made a slight variant of the model and a skin edit of mr.pshyco's assasin skin, if you want it I'll gladly send it to you. Oh, and I saw you used the flag model as a symbol for the Shadow Hearts, it would be a nice idea to copy it onto the War God's banners, just to add another little treat.
Another thing that bugged me: the ninja's stand animations! The one where she taps her foor is completely out of sync with the other ones, and she tilts to the side in it. A samll model edit could fix this.
Overall, I really enjoyed the arcade gameplay, and it would be really nice if you expanded upon it (bonus points for continious kills, combo moves, etc.) I would also like to see a sequel of sorts, with all of Black-Stan's great models, you could make a gem of a map, I'm sure of it. The last thing that I would have liked to see would have been some pickups, even like an instant heal that you get when you walk over it, maybe a speed up, temporary evade, etc. Other than that, everything was in line.
Rating time:
Terrain: As I said, it was fine, good use of doodads and nice tile work on the paths. 4/5
Gameplay: The arcade style was fresh and new, but I would like to see it expanded upon. 4/5
Imports: Great choice of music, nice models and sounds, aside from the things I mentioned, they we're perfect. 5/5
Overall rating: 4/5. Keep up the great work, I hope to see more maps like this from you.