Slick presentation! It reminded me of Thomas Was Alone.
Your concept is solid as well. I liked having the freedom to use gravity and see the outcome (very good idea and implementation btw). However, being able to start from anywhere, at any angle, in any direction was kind of overwhelming. Maybe if I could adjust the balls' rotation and forces before the simulation began, it would make experimenting more forgiving?
Overall, unique game. I would like to see where you take it.