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I didn’t know about Crom (Crom Dubh, "The Black Crooked One") until I researched about the Dullahan, the Irish fairy version of the Headless Horseman; Essentially, Crom was a Celtic god who demanded head sacrifices, and the Dullahan acted as his reapers.
As E.Howard took a lot of inspiration from the European folklore, I'm quite sure Crom was at least partially inspired by it.
Regarding the sound, I ended up leaving it out. I had the audio system and a BGM, but I didn’t include them in the Jam version because I couldn’t implement a volume control in time, I thought it would be more annoying to have loud audio than none at all.