Sticky balls remind me of World of goo,
Would be awesome to have some goals :-)
I know you didn't had time to test some gameplay, I hope you will, give us your ideas.
If the balls touch the edge os the screen it could be a gameover for example.
It would be a bit weird also because of the HD (1920x1080) screens ratio. So maybe the format could be 1x1 square.
Like at 360 Tetris kind of game ?
Just an idea :-)
Cheers,