Most everyone has probably played an avoidance game before. They are generally based on a very simple gameplay mechanic. Orb Avoidance is a simple game of mouse avoidance with the added bonus of a combo system. It's a little mindless fun to get your gears turning, and it won't take more than 10-15 minutes of your time.
Friend Chase is a simple arcade style game in which you run around a courtyard using only the mouse for movement and left button to jump. Your goal is always to collect friends by touching other people of the same color, though how many and in what combination differs from level to level.The gameplay is simple and delightful, and it managed to suck me in for quite a while.
In Rapture Capture, take control of a ship with a tug wire attached by waving the mouse back and forth. The tug wire is your only defense against incoming enemies and munitions, use it as a whip to take out anything that comes at you. The tip of the tug wire is especially powerful, as you can even capture enemies with it and whip them around as a weapon. It's fantastic!
The Jackson Pollock emulator is a simple flash toy that simulates the drip style of painting popularized by Jackson Pollock. The entire browser window is a blank white canvas and your mouse becomes the paintbrush. Move the cursor over the surface to pour paint, changing colors with the left mouse button. Linger over one area for some time to leave large blotches or shake the mouse back and forth for light streams of paint. You may not create a masterpiece, but it's an engaging way to let your creativity flow.
Micro Life is a real time strategy game (RTS) that is quite easy to play, and it has a lot of charm to compensate for the relatively light challenge it presents. Accessible to all ages, this game is one part simulation, one part strategy, and one part Insaniquarium all rolled into one.
An odd and addictive little game of violence against stick figures intent on invading your castle. From what I can glean, the gameplay has some depth by allowing you to purchase additional units and upgrades between levels.