I'm currently 4th on the wifi rankings. Yos.K's still first.
Anyway, it seems the red cubes are only attainable for the snakeline enemies. On random mode, it's extremely convenient if they were the very first enemy to spawn since you can potentially chain the red cubes throughout the whole stage, earning near 2 - 2.2million.
I believe in pattern mode, the red enemies spawn first and THEN the snakeline ones, in which case, I have to break my chain from the red enemies anyway.
Basically in the first stage, when the snakeline enemies appear, there are going to be three waves of them (one by one) before another type of enemy generates. I pretty much hold my fire on the 1st wave until the 2nd wave appears, then when they do, destroy all of them. At the very least, you'll end up gaining the orange cubes. (You can get red cubes if you start shooting at the right time, it appears some moderate timing is required to get red cubes effectively)