I have a suggestion for little upgrade of curent item shop.
When we enter a shop, we have this two pages LEFT one and RIGHT one. On the left page are this butons for all types of items ( defense, movespeed,atack and so on). I think it is little hard to navigate through them when you shearch for some items.
Now I suggest that You build us ON TOP of left page a LITTLE ICONS for every group of items and that this icons would be always accesable. So, when you enter ATTACK ITEMS group and than you search for some DEFENSE item you can jump to DEFENSE item group with JUST ONE CLICK. THANK YOU.