The author of Knytt Stories had posted a concept art for his new project, currently titled Night Game.

Additional information from Nifflas, as pointed out by pi (thanks!):

"I want to create a game that takes place in a 2D landscape. The background scenery will contain slopes, but it does not have to be curved like in the demonstration images.

Except for the static terrain, I am only interested in two shapes. Rectangles and Spheres. The player character will be a ball that can be rolled with the left and right arrow keys. Boxes and rectangles collide realistically with the ball, and can be pushed and tipped."

Nifflas working on a physics game? Scrumptious.

Nifflas' Games
Clickteam forum posting