Good stuff. I have some suggestions that can be added;

Preview inside 3d items: Add vertical camera, so you can drag around the camera up and down, otherwise you can't really see the whole 3d item set for an example.

Adding a Fullscreen button so you can see a bigger image of the actual item that you're previewing.

Personal thing that I think could change in the shop menu; Make the images slightly bigger (I don't really like to play in fullscreen, so I prefer smaller windowed mode)
https://gyazo.com/efd85212e60a0f176b3ff8a3b58965b8 <--- Little gif of the menu i'm talking about