I do like the idea, however using the items is really weird, sometimes you use it sometimes you can't. I think the game tries to get you to pause it to figure out your next move but sometimes items don't take effect which is weird, trying to understand item description while also focus on the actual gameplay is a bit taking. I think if there was some sort of hand slot where you can place your items, it would make the game a bit easier, since you have to constantly click on offensive items to use them. And it's a bit too difficult imo, The stamina depletion is fine but regaining it is tough, some item description state that I can do that but it doesn't recover any stamina.
I think the game goes too quickly to have a strategy of any kind, even just slowing the speed and visuallizing effects of the item could be something.
The premise is quite good and I do think something can be built upon this.