I like it. It looks like a good place to browse through different UI elements.

There are a few places where your UI needs a little polish (The bar at the bottom isn't very responsive and can be janky, there's some issues with box overlap, there's a few places where alignment looks off). All in all I think it's a great start and I'm excited to see where you'll take it. If you get around to it could we have something like this for React-Native ;)?