The weird clicking sound is the music. I put it there in the last moment and didn't notice this part :D
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Hmmm, are you sure? I checked again - stayed in the start for a minute and there was only soundtrack, yes, but it is not the soundtrack I am talking about. It happens only when you walk, and it is very inconsistent, random. Sometimes happens twice, sometimes not at all for several of seconds. This sound reminds me of billiard balls, when they hit each other.