For me games are more immersive when they have the right OST and I really enjoy good OST considering most of my music is games OST.
However I really want to play games listening to my own music and I've found there are little games where music matters that much and even worse is better to put my own music in it. So I want to know which games you anons know that either have terrible music or are better experimented with your own music.
In the case of FTL, I just let anything play. When I play VA-11 Hall-A I usually play some noir jazz or something like that. And Rebel Galaxy is actually really convenient since it doesn't only let you play your own list of songs but even mix it with it's own awesome soundtrack and even select playlists for different situations, like battles or just exploring.