Well, i'm currently working in inventory system, and to me it's being a little bit complicated, if do you know c# and would to help, please send a message.Currently we have a item database working, drag and drop items on the slots, can use some items (like potions), and we have classes of items (armor, consumable, etc).
You can open or close the inventory pressing "I"
If you want to help in the game, send a message or an e-mail:
contact@theninjastudio.com
Inventory in-game: