Agree with guy below
this flash shows potential, but misses a few basical things.
1 - the paint-made graphics made my eyes bleed
2 - the keys for jumping and throwing shurikens do not always work
3 - the ninja sometimes gets stuck into a wall, or passes through it just like it wasn't there
4 - try creating a story around this ninja - it seems he must escape from somewhere: why? what is the place you put him in?