Improvements

So, I added a text that says: Would you like to play the next difficulty? If you click on it, the difficulty changes. It only appears after you win in Easy or Normal. 

I added a tutorial button and screen. It works, but I did not add a special button to go to the next screen because it would be time-consuming and confusing.

My family said that I should change Dmg to Damage and ATK to attack in the tutorial screen, to let the player understand it better, so I did that.

I made a score text at the winning screen. I calculate the score like this:

When I receive YouWin, set Timing to Timer.

If Difficulty = Easy then,

Set score to round ((300 - Timing) * 0.75)

Else

If Difficulty = Normal then, Set score to round ((300 - Timing) * 1)

Else

If Difficulty = Hard then,

Set score to round ((300 - Timing) * 1.25)