While digging around my old 2009 folder, I noticed I had a bunch of songs picked out that I never actually used in the final game. I thought I might as well share them, so you can imagine an alternate experience!
Devoluted was originally a candidate for the start of the game, building up momentum as you progressed.
Sertraline had a fun and creepy Tricky vibe to it, I was picturing it for a Tricky sequence, maybe when he charges down the stairs after breaking through the door.
MachinRAa actually was in the game at one point, for the sequence where Tricky comes down the stairs and then battles you in the elevator. It ended up being Blue brass of the beast, instead.
Systole was another Tricky candidate, maybe for the final battle (which ended up being Dryll).
Smog Step Sanctuary was a banger I never ended up using but it still slaps.
Stimulus was another one that was considered but never found a place.
If you're curious about Madness Regent, I didn't have extra songs laying around but I do recall listening to Bassbin Twins - Woppa on repeat while building out the first half, so it's basically in the game's DNA.