Sorry you couldn't make it past the first level. It's possible you had a really high FPS and either the blue plug or the red plug glitched themselves out of it before the game could notice you plugged something in. (Unity was being annoying with collision matrix and I forgot to set layers, it was too late when I realized...
As of the buzzing, I thought it'd be an interesting idea to have some background noise while playing other than complete silence. We couldn't get music so I just buzzed it. Don't worry though, as soon as the voting time ends we'll release a fix and a couple new featues.