I think the game fits the theme so well and the retroness of the music is 10/10. I don't have any idea to improve it but well done!
If you like the music, then oh boy do I have a treat for you! All of my games are made in PICO-8, something referred to as a fantasy console(basically an emulator for a made up console). These have built in restrictions, such as a restrained screen resolution, palette, and in this case music! You have four channels/voices to use in one piece of music. Each channel can play one sound effect at a time. You have eight different waves to use for instruments and that’s what gives it the chiptune-y charm! I recommend you check out the Lexaloffle Forums, since that is the main place people share their cartridges. The carts are embedded in a web player, so you don’t actually have to pay for PICO-8 to play them! There is a massive demoscene on PICO-8 where they push it to the limit, including the music!