Really cool puzzle game here! The mechanics are pretty intuitive and the levels built around them are really nicely designed with a good difficulty curve! I see you distinguished the differently colored mouths with distinct designs, which is a good accessibility consideration. On that note, I think the differently colored donuts could use some more striking design differences besides color, because even with different toppings on the donuts, there isn't a lot visually distinguishing them besides color at the moment.
Nice work!