Chalk is kind of a shooter, I guess. You control a little girl floating through a side-scrolling world, and have to defeat everything that tries to kill you. The twist is that you don't have any weapons yourself, instead all you have is chalk with which you can draw lines. Depending on the enemyyou will have to draw across the enemy, or draw lines through both bullets and enemies, or deflect bullets.

The game is made by the same guy who made Tripline. Like Tripline, it's Windows only.