NINJA STEALS THINGS game tiles

I've been working on a tile set that conforms to NES meta-sprite restrictions inspired by Chaos Engine era Bitmap Brothers work. 16x16 game tiles, no more than four colors each. NES' ~54 color palette. NINJA STEALS THINGS is the title of the stealth action game.

Actual tile set (so far): http://dl.dropbox.com/u/88157/Game%20Projects/Ninja%20Steals%20Things/tiles_evil_corp.png