Something needs to be done about the end game. Currently skill doesn't make a difference. It relies on the perfect storm of you absorbing a chain of increasingly large bubbles. In 6 attempts this didn't happen as I was surrounded by huge bubbles. 4 times I was reduced to like 4 pixels and had to work my way back up again.

Perhaps a bigger playing area. Make it full screen? Then have more bubbles of varying sizes. This would make it more difficult to get bigger and make the game longer as a result.

It would also be cool if a specific color bounced bubbles off it and couldn't be absorbed. The faster you go into it the faster you bounce off. This would make it a bit more difficult to navigate.