Pretty cool visuals and interesting twist on the paddle games where you need to make things through. Once I got the controls right it was pretty easy to get an S rating, I may increase the percentage a little more. One thing I noticed, there were some molecules towards the end that were bouncing vertically and would never get anywhere close to bouncing in the center, maybe add a “shake” button to add some randomness? Also, looks like there is a bug where the valve starts in the open state even if you are not pressing the button. After the first press behaves as described.