Do you like Wolfenstein 3D? Do you like the Windows Maze screensaver?
Then you'll love this Flash raycasting demo I just threw together.
http://www.newgrounds.com/dump/item/ceb43b86836d b941b0efddeb71316c33
I know it's nothing new, but I'd like to turn it into an actual game, not just a tech demo. As far as I know, an old-school raycasting FPS hasn't been done as a Flash game.
Next up:
-wall collisions
-textures
-sprites/enemies
Spudzy
Damn man, you're stepping up your game!