I think this game really needed to have the incoming squares be a color the entire time. Like always be red or blue. The flickering incoming squares made it impossible for me to know if I was supposed to hold down red or blue, so I kinda randomly picked. I think the core concept of the game is good though if you fixed that one thing.
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Thank you for the feedback! Originally I had planned to have three levels of difficulty, where it started with just single colours, then changing colours and finally rotating, but decided to start with the trickiest mechanic first and work backwards and of course didn't have time to implement, but I agree definitely its the first thing I'll add if I work on it more