Your objective in the game is to collect points by making the green balls drop to the hole in the middle. Red balls on the other hand will increase the gauge on the left, and when this gets full, the game's over. With blue balls you can decrease this gauge. With yellow balls you can destroy other balls, and with purple balls you can swap the "charge" of a ball from negative to positive and the other way around.
When a ball collides with another, these may combine depending on "charge" and the type of the ball. This however depends completely on the type of the ball. The features of each ball are explained in detail in README.txt file, included in zip-file.
Use left and right arrowkeys to change the angle of the highlighted (yellow) ring. With up and down arrowkeys you can change the highlighted ring. With ESC-key you can go to the main menu at any point of the game. You can close the game by pressing ESC-key once more in the main menu.
The game has online highscores, which you can see from HERE. In main menu you can also see the top 5. However, the MySQL-server I use is really slow, so sending and showing the scores may be really slow. Even the startup of the game may be slow for this reason, and it may take some time to even close the game.
Works on Windows 7, but I think it should run on XP and Vista as well.
From the above link you can both download the game, and play it straight from the browser.