This build lets you deal comfortably with big swarms of enemies and big bosses while you comfortably kite and heal.

---GADGETS---

1- Two AOE gadgets.
2- Multi Zapper for strong ST on the rightmost slot to trigger it with the Portal passive.

---RINGS---

1- Major Gadget ring + 2 minor rings to stack some HP. No need to sacrifice gadget slots on HP/Healing, specially with this weapon. Also, combining minor + major gadget ring you already get the best traits for this build.

---PASSIVES---

1-We're obv playing Unstable Lightning.
2- Since this build is not only gadget dependant, but also AA dependant, I've chosen the Chicken. The rest of healing options seem weak to me, even Vampire Teeth. // Expolde-o-Matic also makes sense but seems impractical. If an add resists your gadget burst, he's def not gonna die to the EOM trigger. Chicken also makes sense on ST. // You could swap to Auto Zapper if you don't want to depend on the Chicken RNG.
3- mixtape healing is the way to go.