The retail release for Hover first started through Red Art Games, and then popped up over at the PM Studios online store. Now there's going to be a third option that should help the game reach a wider audience.
GameStop is going to be stocking the physical release of Hover starting July 28th, 2020. This version is still published by PM Studios, so it should be the exact same box and package in general. You can snag a preorder here.