Thanks for the feedback!
Each ghost latches onto its target, giving it “haunting” damage each second. Haunting damage is however, a fraction of the direct hit. Each shot also does damage but, there’s the shotgun spread and the health scaling for enemies (sort of multiplies by the wave number, meaning they can get very tough).
I was afraid of making the “haunting” too over the top and distracting, so it’s just a few blueish ghost particles flying behind the enemy!