Thanks for the feedback! Having no health bars is a decision I made for immersion purposes, but since there isn't an in-game way to determine health or a visual indicator for damage dealt, a lot of players would question if they're doing damage to enemies leading to frustration and boredom. This is especially true to ol' bloody, since he likes to heal when players kite him. This is something I'm working on and will hopefully alleviate a lot of issues.
>Shift + inventory dragging
I'm dumb and forgot to mention what holding shift does anywhere, same with dragging potions - you can middle mouse click a potion either in your inventory to equip it to your hotbar, and vice versa.
Either way, thanks for the feedback! I'll check out the performance issues as well