Tower inventory

Today I finished the screen design of the tower inventory screen. It's really minimalistic! inventory Every tower can hold up to four items. Right now it is planned that from scratch you can equip one item slot. All other slots will cost gold to unlock, while the price increases with each unlocked slot. If you tap on an unlocked item slot, the item card deck will pop up and you can select which item you would like to equip. On the bottom is the potion button. If you tap on it, the potion card deck pops up and you can choose which potion cards from your deck the tower shall use. What do you think about it?

Right now my feeling is that the potion button is little too big, need to sleep over it!