I like this idea, though I feel like the timer is a little too short. Perhaps giving the player a chance to try and memorise the screen for a few minutes before actually starting the game? Is a fun little game though, and a very creative idea :3 so good job!
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The timer is actually adjustable using +/- on the keyboard, so you can adjust it to what you're comfortable with! As for some time before starting the game, I personally like the idea of memorizing as you go, especially because trying to memorize right at the start can be overwhelming without a singular object to look for.