Good job on your first GWJ! Add soft and loud fart sounds, please. And a munch sfx for the regular food. It'd sound so much sweeter. There are lots of other polish type things you can do, too, but priority IMHO should be the fart.
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You can use an AudioStreamPlayer node like AudioStreamPlayer2D or AudioStreamPlayer3D.
https://docs.godotengine.org/en/stable/classes/class_audiostreamplayer.html
Or the way I do it is adding a AudioStreamRandomizer resource into a folder (right click > create new > resource and search for AudioStreamRandomizer). Then drag that into your tree. It'll give more options like multiple sound files for your SFX and randomizing the pitch and volume.
And then you call the [node_name].play() function right before your desired action.