My first thought was that this game was really cute and well themed!
The music is cute and playful which I really enjoyed, and it ties in very well with the theming of the game and art :) I did, however, have a problem where the music failed to loop after the first approx. 30 seconds of playtime. My single most favorite part of this game is the happy expression for when you're done with a character, something about how smiley the characters look is so contagious :))) I kept finding myself grinning whenever I was done with them!
I really like how there were conditions for the color of sticker each character wanted, I found it fun and like how it constrained your ability to appease every character. I do think it would be really cool if it was harder to make ever customer happy, as I think that would make players more likely to think longer and use more tact in their styling activities!
When cleaning shells, I find that in at least one sprite some of the grime was sightly off of the shell in a way that made it hard to see where the grime was against the background. I think that having a little outline in a bright color around the edges of the grime could make it easier to see if any problem arises where the grime isn't quite fully on the shell. Another suggestion for shell cleaning is that a circular reticle around the cursor could really help. I found myself kind of guessing how much grime would be removed in every click, and if there was an indicator or reticle it would've been easier to place the cursor.
I found myself most enjoying the shop box lottery! It was a fun little treat at the end of a day to be able to open a box and get cute decor, although if you had more time I think it would've been really cool to see even more than shells, hats, and stickers! That leads me to the point that the gameplay is fun, but gets repetitive after a couple days, although for the time we had allotted I do truly think that this game is pretty well put together. All in all, I didn't find many bugs and the theme was well put together!
Cute little game :)