Fair call. I probably should have done more with the theme of the Jam.
The way it works is that each bird you kill makes the music quieter (it actually loops indefinitely otherwise.) and that each tree you cut down causes a bird to spawn. Basically my take on the theme was to see if I could make players feel bad about cutting down the forest using silence.
That said, there's probably more I could have done with this idea. Thanks for the feedback!