The development of computer skills such as mouse and keyboard control is vital. Scratch is an excellent format for creating kid friendly games to encourage these skills due to the existence of Scratch Jnr.
Scratch Jnr is a simplified version of the language intended for 5-7 year olds, meaning that not only will these games increase your child's skills - but that if they show an interest they can view the creation of these games and have a go at creating their own! Coding skills are becoming increasingly useful in our society and introducing a child young to these skills has benefits that go far beyond encouraging them into a specific field.
This is my example level - have a play!
This game involves collecting falling notes to increase size and clicking audience members for extra points.