Coldenlight is a free cooperative action-adventure game with a strong focus on open-objective based gameplay. The Coldenlight: Survival Horror Alpha is currently available. (The final game will be free, what you purchase is early access and alpha content that will not be released for free)
This shot is pretty old. I figured I should show it though since I plan on having a level or two in the future based off of this idea. (still long time from now)
I'm sure you can all tell what it is. Minecraftish gameplay elements with modern graphics.