Yeah, once it happened I figured that. I expected it to be equivalent to +1 damage and +1 heal on the weapon rather than being a separate attack. If the extra spike damage is intentional, I hope the tooltip gets updated, because this makes a couple of bosses way more deadly
Awesome game :) IDK if it's intentional, but attacking a spiky enemy with a pickaxe affected by a vampirism gem causes the spike damage to trigger twice per attack, which was unexpected and pretty brutal