Here's the final project I ever worked on. It was a platformer which revolved mainly around the concept of stomping enemies to defeat them. As you advance through the game, you defeat bosses and steal their powerups, which can be used to good effect. Powerups included a laser cannon, shield, a timer that freezes time, a jetpack and an invincibility-granting fire wheel.
From the looks of things, this was worked on back in 2010-2011 if the time stamps on the file are to be believed. The game concept involved the gang being kidnapped by aliens and cloned to create an army of serviceable drones. Cartman goes onto their spaceship to fight them off, although he ends up facing as bosses clones that were created after him which are meaner than the rest. So was Cartman cloned too?
Most of the game framework was done, with about every enemy and trap devised so what was remaining what the level creation and of course the music to come along with the game. Only 2 levels and a single boss fight were made for the game, but I've left the sample test level I made to ensure everything was working fine as well than the zoo level to test out enemy behavior. You can access that from the title screen of this game which ironically has no name.
Sounds like it would have been a promising game although I doubt anyone would have played it given the time-frame. By 2010, felt like freeware games were pretty much out-the-door. Still, having people actually post their projects on this forum reminds me of the old days when there was so much promise.