Simple concept, yes. I think it's like DDR, but with your fingers. And, you only have to hop-scotch one square at a time... If you're good on a keyboard, this should be easy. I had to hunt and peck

AND, I was still way faster than the guy in the vid.
There are 9 buttons, one for each square on the lower grid. When the sun bursts start, the player presses the button for the square to either open and swallow the burst or open and shoot it (fire button)... you can only play one square at a time.
PAC ANT and I played a 2 player... as player 2, I had to play the top grid. That was fun