Jellicious
This is a great game and very difficult and I put that down to the method of control. I far prefer to use the mouse and it would be great if this could be a choice.
I do however think the "freeze" button is rigged in favour of the computer in all the time I played, I got frozen at least 15 times and only once was I able to freeze my computer opponent. Just kidding, some sour grapes I'd say....how can you tell I lost.
I look forward to seeing additional power ups with even more interesting characteristics, how about one that triples your size so that you have a greater chance of catching new power ups. Also you might want to consider some "bad" power ups that will actually have a detrimental effect on the one who picked it up.
It'd be great if you were racing towards the orb when all of a sudden up pops a "power down" of some sort. These could come up at random and would certainly make the game more interesting and just that much more difficult. Another "bad" power up could be to make you lose 100 points if you run into it.
Overall and excellent game.