Lagrange Point is a futuristic RPG by Konami. It is the only Famicom game to use the VRC7 mapper, which—in addition to the usual scanline counter and ROM mapping features—provides enhanced FM sound, courtesy of a modified YM2413 core.
Hold A and B on the second controller while powering on or resetting the game. Controller one is used to control the sound test. Press UP or DOWN to increase or decrease the song number, respectively. Press B to play the currently selected track, or A to stop.
The Game Genie code GAVXUTEI re-enables some strange easter egg at the ending sequence. When all characters are surrounding the main character and the nurse is kissing him, press A on Controller 2 to move all the characters closer. Release the button to return them back.
There is an unused code to add the animated star field to the title screen, disabled in the final release for some reason. You can easily re-enable it with the Game Genie code XVEKITAV.
And it seems there should be code intended to flash the palette for the title name's frame at some point during development, but it's quite unfinished and has a lot of bugs in the corrected version. You may still see how this should look like with additional Game Genie codes, applied to the prevous one: SAOGLNSX+SAOKLNSX+EPNGAYEL.