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but you are using unity, you could at least add a background music, just drag your sound file to the hierarchy menu in unity to add background music

That's true. It took me a while to get the mechanics working though, and I was treating that as a top priority and that I would add sound effects afterwards. By the time I was done I was too close to the end of the Jam to add anything else.

Once the jam is over, update it with sounds.