ChangeBlindness is a small game that demonstrates the change blindness phenomenon. The effect shows that our brains have a low-level (i.e. subconscious) change detection capability that can be disabled pretty easily (for instance, with a flicker of around 100ms). The game illustrates this using an increasing number of icons, one of which will change during a flicker. The goal of the game is to find the changing icon as quickly as possible.
Rebound is a reimplementation of the game called Diamonds which existed for the Macintosh in the early 90s. It is a cross between a puzzle and an action game. The game play requires the player to use the ball on the screen to hit bricks and destroy them. However, rather than hitting the ball with a paddle like breakout, the player controls the left and right movement of the ball with the arrow keys. The ball still bounces up and down on its own, but there is no bottom to fall off of.
nPush is a logic game somewhere in between Sokoban and Boulder Dash. You need to collect all the gold on the level and reach the exit. To make it hard there are some rocks that stand in your way, and you also have some dynamite to blast them. The main difference from similar games is that you can have multiple player-controlled characters on the screen.