Well, these days I've been making some changes to the code to improve the "dying sound", and other parts of the code to save space in rom.In this version I've done the first intermission, but still does not have the right music, because the routine occupy more space than I expected. Although I could try to do it another way to save space to include music.
I'll start making a version with 8k to include everything that has the game, and I think probably would have free space on rom.
This game is awesome! Since you are starting on a larger ROM size version you might want to try just 6K a la SuperCharger format instead of 8k - still plenty more room.