The dynamic soundscape is delightful, as it subtly adds instruments and musical texture as you progress. And going back down the scale regresses it to simple again. Smoothly done. It reminded me of Operation Neptune (1991): each level starts with just one channel, probably percussion, and as you progress through the rooms it adds and removes more channels or sometimes switches to a different section of music. It is u…
Man I played Operation Neptune a lot when I was a kid. I wonder if it was the first game to do this style of adaptive music layering. It predates the iMUSE system used in LucasArts games like X-Wing and TIE Fighter. For anyone curious, you can actually play it here: https://archive.org/details/msdos_Super_Solvers_Operation_Ne...
So not exactly the same, but perhaps prototypical. I think Asteroids did as well.