Reached a score of over 140. The screen changed before I could properly read how much I scored. You may want to show the player's score along with the high score. You could probably show some visual feedback every time button is pressed and score increased. Please check out my game.
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I did not use auto clicker. You have to realize that a game which requires the player to rapidly press LMB is going to have players that will press LMB rapidly and they are not going to magically know exactly when the 20 seconds are up. So they are bound to click once or twice even after the 20 seconds are up which is when the scene changes.