I really like this kind of experimental game letting you space for interpretion.
There are basicly to things I espeacialy liked about your game and support it's message: First is the constant "struggle" of keeping up with what's going on on both sides of the screen as you do not want to miss out on anything.(Maybe you could have made this a bit harder though). The second thing is the uncertainty you have before interacting with other shapes, which fits your game nicely.
All in all a truely worthy entry, keep it up!