Not really a lot to criticize here, beyond wanting more of it. If I was being really picky; I could comment on the fast slap audio having a slight metallic / glass bottle quality to it, but that could just be a stylistic choice. I'm not seeing any clipping, the movement is smooth, and the jiggle matches up to the rest of the animation.

Regarding saving and loading, generating and displaying a text string the player can copy and paste is a quick way to achieve it. It also provides some compatibility with mobile and incognito browsers, along with not requiring access permission and file dialog coding.