Here are some suggestions that would spice the game a bit "I think";
1. Some AI. The sight of an enemy hero would be nice. Since i cant connect to battle net and only a few people here play custom maps such as these and they only play DOTA. I t gets kinda lonely fighting mobs.
2. Some consumable items such as kunai, shuriken and etc. I see you have the ichiraku ramen stand, and i hope that would provide hp and chakra restoring items.
3. Jutsu Audio, i noticed some jutsus have audio like Chidori. I think it would be fine if you'd put on audio on all of them. Hearing Naruto say "Kage Bunshin no jutsu!" really revs me up to use it more. If the audio you put in are just recorded sound clips, i can offer you some.
4. About the models, i really like them all, except Sasuke's. Jabbing enemies with his bare fists and a boxing stance is really weird for him. You could ask Ultimaa make a new model where he uses his Kusanagi Katana and Sasuke is more of a kicking type ninja than a boxer.
5. Some Mob drops, like power ups, consumable items, gold, and etc.
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Hope you would get ideas from this, since i have really high hopes for this map.