It shows promise, but needs some tweaking. Having the controls for both balls on the arrow keys makes it difficult for control. I suggest either letting users set the keys or changing the system from just arrows to adding wasd so users can use both to control. Also, a bigger screen would be nice. I can't say this will ever be a Newgrounds classic, but i will definitely be one of the better minimalist games on here.
I found the game a little annoying, and having very little control over the balls didn't help.
The most important aspect of any game is: "is it enjoyable to play?" Unfortunately, this game is not enjoyable at all.
Always put in-game instructions, not just in your author comments, as they are often hidden off-screen when the screen comes up. Also, be clear in your instructions, which is easier to do in-game, as you can have examples. Am I safe if a red ball hits my red ball? Or is it that any enemy ball kills me? These are things to think about for the next game, but this one was not fun at all. Count it as a learning experience and start another great project. :)
This is the kind of review I needed. Thank you.
cool concept, sorta impossible though