Short-length Games:
Carrot Leader Guy Series
My first Gamemaker creations. Made in a day. Play at your own risk. The first one was so terrible, I needed to make a sequel just to redeem myself. That one at least has some cool gameplay elements. Boss battles and stuff.
Engines:
Desktop Kart Engine
I'm not sure how I managed to pull this one off, but this is a very smooth engine.
Paper Fred: Exhibition
An exhibition and engine to show what I've learned using Gamemaker. It was completed within the course of a month. It will be made into a full length game in 2013.