The pass it on / relay mechanic is super creative. The rats are super smooth to control and the movement looks very nice as well. Also having the objects move a little or a lot depending on orientation is a fun way to switch up the basic sokoban gameplay. The sounds were all really well implemented but maybe just a bit too jumbled at times. Like pushing an object out of the maze would cause notes to fall on top of each other. And the rats squeaks could be a bit rapid fire when moving quickly. Very minor complaint though.
Great job on this :)