It took me a minute to figure it out, but it’s a cool concept. The icons are a bit small and there are a lot to watch as the game progresses, but I like how you can quickly glance at them and estimate which button to press. If you add acceleration over time, I think you could reset the combinations each time it accelerates, and once a certain number of combinations has been added, it accelerates and resets the combinations again. I think that would make for a good difficulty curve. Good job!