Laue Labs
The Imagination of Ellis
The Imagination of Ellis is an app from Laue Labs, on the US App Store. It is a block-building island for ages 6–8. Ellis builds machines from motors, axles, and wheels, and the parts move.
The price is $4.99, paid once. There are no ads and no coin shop. It runs on iPhone and iPad, iOS 15 or later. The seller is Ricky Haney. Family Sharing is supported.