You really should have a dedicated Heal/mana button, even if clicking MMB in the Inveotry instantly consumes it, you can't keep that open constantly with the Enemies on screen etc.
Did you test the Bloodguard fight? He definetly does not have a weak melee attack, and he also definetly doesn't go down quickly in melee. Maybe I was just underleveled and undergeared, but I did clear everything I could find on the first Floor.
As for the Goblin, I need to click on him to open the Inventory, then left click on an Inventory Item 3 Times to sell it? But why 3 Times? Why not just click on it once to sell? Theres nothing to be gained from either you or the Player for clicking on it three Times, right? Also I'm not going to reopen and play up to there just for that, but I'm pretty sure there were only 2 Torch pedals, one on each side. Is there one behind the Statue or something maybe? If so that was blocked by the Inventory Screen, so I couldn't see it light up.