Love this. I did something similar myself. I wanted to create a sequel to one of my favorite old PC trivia edutainment games for MS-DOS that I played as a kid, RedHook's Revenge, which came out in the early ’90s. This was decades later, but the original author was happy to work with me and gave me permission to release an official sequel which I did! So I really like this approach.

I’ve personally never played Realmz, but I watched a few Let’s Plays, and I have to say the music feels hilariously out of place. I found a great article [1] which speculates that the original devs just dropped in some random tracker/mod music. You should definitely ask the original authors about it if you get the chance!

[1] - https://frostillic.us/blog/posts/2024/3/31/realmz