Sean Cooper's new online simulation of the classic game of marbles. Aim and shoot a white marble, attempting to knock red marbles out of the circle. The lack of AI opponents or online multiplayer is a flaw, but overall it's a fine iteration of a very niche genre.
If you are looking for a break from the standard RTS fare, or just want to play through a really well-made game, then look no further than Shadez II: Battle for Earth. This 2D side-scrolling title is extraordinarily well-made from top to bottom, providing enough strategy, explosions, and alien killing machines to keep most RTS fans busy for some time.
In Boxhead: The Zombie Wars, your goal is to stay alive for as long as possible, but there are several ways to go about it. You can choose to take a more offensive front and plant traps for the zombies like exploding barrels, or a more defensive approach by building yourself a base complete with rocket launching turrets.
wOne and wOne 2 are fun little arcade-style Flash games in which the object is to maneuver a wheel around each level and clear all barrels to advance. And while there isn't anything all that innovative about either game, the excecution is what makes these games special and fun to play.