This game is titled X-Scape in North America and X-Returns in Japan.
Alternate title screen
Successfully complete the game. The logo at the title screen will turn from red to green.
Totaka's "KK Slider's" song
Save the false doctor from planet Mapate. You can identify him by his sunglasses and the tongue sticking out of his mouth. Bring him to the main base on planet Mordarl. Progress through the dialogue with your robot until he asks "What's that?!". The music will change. Remain idle for about three minutes until the "KK Slider's" song begins.