Hi Tracy, your website background is cute. It is colourful and fun, which makes me feel happy. Also, I like the instruction button on the main menu so the users can click on this button and look for help. Lastly, I like the colour combination and shape of your turtle, especially their eyes- looks so adorable!
However, it will be good if you can add more objects/scenes next to or behind the title. Also, if you can put the name of your game on the banner, people then can know about the theme and topic straightway.
Overall, I do believe it is good user design :)
Cheers
Rosanna