3. try to add normsl doors that the ninja can slide across.

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I liked the finish. Its so hard to finish a death dda satisfactorily.
3.5

I though death DDAs were typically lame because the ninja doesn't always do the same thing, but you seem to have it worked out pretty well here (the mine is the only potential problem). Nice job.

...that the mine sometimes causes the ninja to explode. Other than that, it is good.

@ Seifer - A death-dda is simply a dda where N dies, and then goes through the map as a corpse.

...Nobody I've heard of actually likes mines in death-dda's, as they can spoil the whole thing.
4

that's pretty cool, took me a minute to figure out what you meant by death dda since I never heard of it before.
Nice job :)