Hey there 👋🏿
The main menu music is Victus by Hell:
https://open.spotify.com/track/3uvMDPYYHxfMUlUYkxleV4?si=cadtzCFaQ7KkbrSRWYD3ew
Check out the rest of the album if you like it ♥️
https://open.spotify.com/album/51iAT3wI6JnBAk9G2YI7L6?si=NsBQ3DKSRZyo5YOIj4AsnQ
Helmzmen is another favorite of mine from it.
The in game music is Not so resolved by Tim Kulig, I found it on one of those copyright free music websites and got hooked instantly.