Pause menu and bug fixing

I have uploaded a new version with a lot of minor bug fixing and a pause menu, here you can set the graphics scale (normal, 2X, 3X), set the audio volume for the sounds and the music, restart the level , exit to the main menu (not implemented yet) and quit the game. Exiting the pause menu will save a cfg file to remember your choices :)

Thanks for your time and enjoy :)