Hi @awei - it looks like students are having fun with their clicker games!
It looks like the issue is that the variables of "score" and "lives" are never being re-set. At some point (either when you click the "play again" or "start" button, you should re-set the score and life variables by writing the following code:
That will update the variable values. You will also want to re-set the text on the screen by calling the "setText" command when you press the "start" button but AFTER you re-set your variable values.
Hope that helps!