Sorry, I meant to say you click an item and click it on him to "give" it to him. You do that 3 times and he will give you an item in return. There's a brazier on either side of the goblin, and one in the back( it'll go left -> back -> right so it's not like the last one is hidden)
Sometimes you can get unlucky and roll a weak first floor, which may have left you unprepared to deal with Bloodboy. It's a downside of random generation being given a lot of freedom and not enough constraints, or perhaps bad drops, etc.
As for the healing, you're right that it's tough. It's also something I need to look into. Several people had the same thing to say when it comes to that. I already have a "dedicated slot" option where you can set a slot to only accept health pots, perhaps I could assign a slot to "autoload" potions from your inventory.
Thanks again for your detailed feedback, I appreciate it all and it helps me improve!