Thanks very much for your feedback! (And also for organising the jam)
The main thing I struggled was getting the balance right between creating enjoyable chaos and confusing mess. Admittedly I think it's still on the confusing side, so this is definitely something for me to consider for future games. I plan to improve the game instruction, but ultimately I'm aiming for something that doesn't need explanation. (Main thing is, You can satisfy puppies based on what they carry into the game (throw toy / bone if they bring one, brush a puppy if they bring a brush, feed a puppy if they bring a bowl)
For the music, I reused a web audio component I made last year - consequently the sound is a bit plain, and as you pointed out the volume needs more work. This is also something I'd like to optimise further by studying how your ZzFX works.
I also appreciate your feedback regarding the background and replay value. I'm planning to work on something else next, but hope to improve this game once I have better idea of where to take it.