I was entertained the whole time.
I enjoyed this flash greatly, I thought the fact that you would say all of the sound effects the characters were making was hilarious. The plot of the animation was really clever, I hope you do consider making a sequel. I also liked how the music was calm and relaxing, but the ninja would kill people while it was playing, irony at its best.
The animation could use some work, it would benefit the flash immensely if you tuned it up. I also noticed that the lip sync was somewhat off as the movie continued, you might want to check that out. Aside from those two things, I thought this was a well made flash.
Sequel or not, I still will come back to watch this flash every now or then. It was just short of a perfect score in my book, but you show great skill and humor and I'm sure your animating talents can improve. Keep up the great work!