Cool, here it is:
'Once it's game over and return to the main screen, the music plays again on top of the previous track. It seems your music object got re instantiated.
'Check the colliders, the character can get stuck to a wall or platform if you lean against it (although maybe it is a desired effect, you are some kind of candy-slime).
'Adding a sound effect when you bounce would make it even more satisfying. Also when an enemy touches you.
'Lastly, learn to use TextMeshPro and how to import fonts, it will make a big difference in your next games!
Again, great job and keep going.