For the jam there is no distinction between a VN with choices or without, so feel free to just make it "kinetic", there are quite a few VNs without choices in the jam. Have fun and thank you for participating!
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Yes, you can loop specific sections of the song if that's what you mean. If you have separate tracks for each instrument loop, you can still do it, as long as all instrument loops together form a consistent whole (i.e. you don't have separate melodies and mix and match since that would not really be a single song anymore)