I like the design for sure. I wonder how it will work multi-platform tho because coding the UX might be a pain for Xbox and mobile. I also think the search bar color is off in the top right of the backpack UI and maybe only allow like 5 items to visualize in the main UI because all 11 of those items dominate the screen quite dramatically. If you want you could put arrow buttons on either side of a lesser amount and use ClipsDescendants + tweening of some sort to slide between all items in the main ui so you don’t have to open the entire backpack necessarily.
The colors for the interaction buttons aren’t the same, you might have to fix that, apart from that, you might have to use some shadow elements for the UI.