Illustrations to a child book about two cats and Santa Claus

The main heroes are two pets, a brother and a sister.
They live on a planet, which on the one hand is pink and on the other is orange, and between these parts the orange river flows.
On this planet they find a mushle and each of them wants to get it. The box is cooking. It appears Santa, gives them a small task - spots of small, after which it gives the pockets another mouse.
Three heroes that repeat.
Age 6 to 10 years.
Australian

Process of creation: https://www.youtube.com/watch?v=7TgLB2hNYVg

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