FREE: Curvatron [Steam Key]

The listing, Curvatron [Steam Key] has ended.

Single-button controls that are easy to learn, but hard to master
Quick, bite-sized sessions. Can become quite addicting!
State of the art minimalist visuals (please help we need real artists)
Soothing sound effects will make you chill so hard you won't know who you are anymore
30 different soundtrack pieces made by people around the world
Level editor (the same that was used to make the available levels)
Workshop support to get new levels and share your own
Several game modes:
Adventure: complete several levels with increased difficulty, until you quit in frustration
Classic: collect points and survive as long as possible, until you quit in frustration
Evergrowing: no points to collect, just try to get as big as you can
Creative: share your pretty snake art with your friends
Multiplayer: tron-like mode, for up to 8 players on the same system

More info: http://store.steampowered.com/app/404700/
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This game includes steam trading cards

Good Luck!