This is wild. I was a huge My Singing Monsters fan when I was younger, and I have for the LONGEST time had an idea for a merge-type game where each successive evolution plays a different tune in a band. So strange to see this niche idea in reality, by someone else. But congrats on beating me to it :)
Besides all that, really nice game! I love the animal designs and how they combine with musical instruments. I liked the use of the palette in the setting as well. I laughed out loud when the frog did the amogus.
One issue I had: When I clicked the tree or moved creatures around, the music got crackly and cut out. Maybe just my potato laptop...