>>723360028
You're right. I remembered that they have the jukebox, but I thought the tracks were changed when fights started. I confused that with the tracks generally being halfway between "combat" and "peaceful" and generally so long that you don't notice it's the same one, plus later missions (starting from around 5) being so filled with combat it might as well be constant, plus factions all having their own sets of tracks that IIRC only partially overlap.
From what I remember of digging in the game's workings the largest change was due to how weapons to warheads worked, but I can't remember the details. It is some strange set up where it is less straightforward than in both RA and TS.
Either way RA's congenial defects like some impacts unavoidably creating splash or attacks on air units damaging things below the the sprite of the air unit (not the shadow) turned out to be impossible to fix without actually putting the binary through a disassembler so I gave up.