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Really enjoyed it, I thought maybe this had something to do with unlocking the door but apparently not.  Anyway, here it is on the Gameboy I’ve owned nearly 40 years.  Added a new LCD recently.

The checksum is wrong and the ROM end address is wrong.  This won't boot on an original cartridge PCB.

Checksum is 6A8D

ROM end address is 003FFFFF 

The addition of more music tracks has made this game much better.  I'm still unable to get it to save on an actual PCB, and there's some mistakes in the ROM header.  I think with some simple fixes you could have this playing great on original hardware.  I'm happy to do some testing for you - I'm user pbj on the Sega Xtreme discord channel.

I have this booting and playing on original hardware, but unable to save any scores or progress.  What type of SRAM support does this have?   I noted that the ROM end address is incorrect in the header.