Poop RTS
An RTS game for players who don't like RTS games. Interface is kept as simple as possible and ordering units is simply dragging. Also check out the article I wrote about designing it so far.
Dogfights
Top-down game where you fly a plane and try to take down other planes.
There Be Dragons
A dragon that vomits flames and starts forest fires.
Fantastic Facotry
A different mechanic every few seconds. Try to make as many correct 'shoops' as you can within the time.
Gunmods
Another sidecrolling shooter, but here you modify your gun. Spees Kwalas was based on this prototype, but all the modification was ditched because it sucked, really.
Bonk
Zombies are coming at you and all you have is a ball on a chain. Move your mouse to swing it.
Gustaf
Platformer that was going to be based on a surreal narrative, but was ditched for high production value. Has a couple of neat mechanics, though. One Man Army was based on this prototype.