William's Mod is a lite user-friendly sandbox game built on the Source Engine, featuring minigames and tools for creation
Download on Moddb
Joompy is a FPS/Platformer where you destroy the Danish empire. It was made on the Half-Life 2 Beta
Download on Moddb
My Morning is a horror game developed on the GoldSRC engine
No download link is available
Cat Bread Factory is a hyper-palatable clicker game where you hire felines to manufacture bread.
You can hire a variety of felines, from lowly peasants to dictators.
This game was originally made in a day
Flying shells is a topdown shooting game where you pick a tank that has unique stats
then battle an AI opponent, after each battle you can purchase from a variety of shells and train your crew