A lot. Most of my games are unfinished, but I released four games on the internet. Generally I got some pretty positive reactions and A Slightly Difficult Game, my most succesfull one, has been played by about 800 people (including the well-know indie developper Jesse Venbrux, which is quite an honour).
Anyway, let's take this chance to shamelessly advertise them:
Unscientific Fiction [http://ifdb.tads.org/viewgame?id=visgp8mtw1wjlrx5]: A comedic Sci-Fi Interactive Fiction that's pretty big, absurd and full of puzzles with strange but logical solutions. Almost nobody has bothered to try it out yet even though I worked on it for years. I'd really appreciate it if someone would want to give some comments on it.
A Slightly Difficult Game [http://www.yoyogames.com/games/show/59370]: a ridiculously hard platformer that parodies fake difficulty in 8-bit games and adds another dimension to it. Inspired by I Wanna Be The Guy and masochistic Super Mario World hacks. If you can even beat level 1 you can call yourself a true hardcore gamer. So far only four people (including me)have finished it.
Asteroia [http://www.yoyogames.com/games/show/65461]: An arcade game in which you must save the world from incoming asteroids by using gravity to change their trajectories. It will need a bit of getting used to when you just start but, according to my friends, it can be pretty addicting when you get the hang of it. Has online high scores.
Zyxis: A puzzle game I made a few years ago. Not online anymore more but back then it was appreciated by the few people that played it.