Fixed a bug where enemies with sprites where the "centre position" wasn't at the origin, or where the hitbox wasn't at the centre of the sprite, could react oddly to taking damage -- bounce in a weird direction, create particle effects in the wrong place.
Been bugtesting the most final of final bosses.
That sounds like a lot of progress. Considering you're bugtesting what I assume is the true final boss, I take that you're in the end stages of development?