I've made a puzzle game, which is my second game, and I'm using Macromedia Flash. As you know you use actionscript in Flash, and there are really alot of opportunities, and I think it's a good way to start making games.
The idea in the game is different from others I think. I've made all the graphic of my own, and my main focus was on the gameplay.
Here is my game:
http://www.antony.dk/balance/











