Made a win screen, and made the UI look better

I drew a simple win screen that looks like a diploma, and the red circle at the bottom is a button which takes you to the menu.
I drew more of the UI myself, and I think it looks better than using Godot’s Labels.
For the minigame timer though, it really was easier to just use a Label here because I didn’t feel like setting up a custom pixel art font just to display some numbers.
I added the Quit button to the main menu, and made the Play button green.
Now, the main thing I have left is making a death screen, and probably one more minigame.