Thank you very much for your nice comments and your support!
To answer some of your questions:
1) Yes, all the sounds come from the Game Boy. No effects were used.
2) The yellow thing is (as some of you already pointed out) the Game Boy Camera.
3) No Game Boys were harmed during the filming of this video.
DOWNLOAD FREE MP3: http://www.mediafire.com/file/7sdbi2ik4263bwx/GameBoyMusic.mp3