Interesting concept! I like it, it is challenging but not too difficult, the timer gave me just the time to seek for the correct answer. But maybe you could have made the timer a limit for how long you can watch the board with all the combination, and let the player take all his time to give his answer after the countdown is over, because it is a bit stressfull not being sure if you are going to type your answer quickly enough haha!
The tutorial was great because the text showed up right nrext to the thing it explained and it made understanding the game much easier!
I will say that the game can get a bit repetitive after a while, but I enjoyed it for the time I played!
Also, the buttons hitbox positions were a bit off on the web build in fullscreen (with a 1080p display), and I had to click outside of them sometimes.
Fun game, good job :)