We polled over 800,000 random people on the street and asked them one simple question: are you a squid, or are you an octopus? The response was overhwelmingly the former, prompting us to re-evaluate our personal belief systems so that squid occupied the highest echelon of importance.
Spaceball 2000 (Mac/Win, ~20MB, free) - A great little sci-fi-themed ball-bouncing physics-based platform-puzzle game (could I have worked any more hyphenated phrases in there?!). Use the [arrow] keys to move and build bouncing momentum as you work your way to the key card that opens the level's exit. You can also reverse the stage's gravity by tapping the [spacebar], though you're limited to a few of these in each stage. Use the platform-specific links above to download the game directly.
Squid Yes! Not So Octopus! (Windows, 6MB, free) - An arena shooter with an unusual name, you take control of a squid (not an octopus, mind you) raised in the shadow of a mushroom cloud trying to fend his home world from alien robots. Oh, and it's his birthday, too. Fire your Beams Of Electro Death to destroy your foes once and for all!
The Manipulator (Windows, 5MB, free) - A 2D puzzle-platformer with a unique twist: your main weapon is the ability to control the enemy! Tap [X] to "fire" and hit one of the soldiers, then control him as you would yourself, using [X] to shoot your weapon. Move through the level and clear the way using these hapless souls, and when you're good and ready, walk your way to the exit at your leisure.