Nicely done game with a design flaw - letters move in a sudden fashion causing a lot of eye strain just to read the next letter. Most people who can type 80+wpm will find it very hard to read the letters ahead as the motion is not smooth. This is compounded by the fact that the letters have no relation to each other. typists typing at fast speeds dont actually read letters, they read words or even sentences at a glance.
My suggestion is to move the letters smoothly - accelerate the pace at which the letters come or decelerate based on how fast the player is typing them.
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Sure, thanks for feedback :) I will repair it in next update