Let's see...
Let's go over the good features first. Good:
THere are special attacks...
There are surprise features like minigame: you have to wait and slash the opponent ect.
Bad features and what you could improve:
Most of the time there is no death or pain scene. I mean please animate one for the ninjas. People don't take hits just like that.
The minigames are way too hard for most to play. You have to react friggin fast.
Please add music and sfx.
Okay okay I'm not a real pro in flash but this is what a gamer wants in a game.
The game sprites are really confusing we don't know which is a power up or shuriken or whatsoever.
Either way it is a game that has a potential to be improved.
Hope this helps. :D
(Btw nice Pokemon hahahahaha! Lots of surprises in this game.)