swell game
awesome first attempt! i like the exploding paint effects.like some of the other comments mentioned, it would be nice to have some differentiation - maybe other geometric shapes that are introduced along the way, which different attributes. the colours do that already, but it would make it more interesting to change their shapes as well. random power-ups would be nice. also, maybe some mini-missions, like a new group appears with the instructions to 'kill all the blue ones first' or something like that, for extra points.