changelog:

-Change aspect ratio from 4:3 to 16:9
-Added fullscreen and mute buttons
-Volume can be adjusted with + and - keypad keys
-Can go to main menu with "Escape" key now
-Fixed a bug where instead of a music track, windows error beep would play
-Fixed achievement description (score 600 points instead of 500)
-Fixed not being able to take screenshots with F12