Octopus character you created looks great! love the other pro builder objects as well.
My thought on how you could improve the design would be to increase the size of the menu buttons to increase usability
Nice colour scheme, the dog character built in pro builder also looks great! Love the textures of the beach ball, coconuts and shells.
Something that could be improved is the feedback colour of the buttons as the colour is very similar to the background of the scene and they become bit harder to see
Love the scene, and the objects created in pro builder are very well done. I Like that the buttons are different colours for easier differentiation.
As Mitch has also said an improvement that could be made is the size of buttons to increase the usability, and potentially slightly increase the size of the turtle and tree on the controls page.