Added option to change screen size (Winsows/Mac)
You can choose from 5 different sizes
800x450
1024x576
1280x720
1600x900
Full screen
If the window is not in full screen, you can change the window location by dragging the mouse, etc.
Other changes 1:
The hit point of the body hit of the Key stage boss was made a little smaller.
Other change 2:
A buzzer sound is now emitted when a box cannot be thrown with the up key.
Boxes cannot be thrown if they are too close to a wall or if they hit the ceiling.
