This build is OUTDATED. This means you will have to improvise to make it work. Builds are outdated when Power Pills (or Free Pills) are included in the strategy. Free Pills have been removed from the game because players stacked the pills with Power Pills Turbo.
Aside of healing teammates, Voltar possesses a few upgrades that let him play agressively. This build allows Voltar to be both a strong pusher, but have the power to force enemies out of lane or kill them upright. With additional damage, pushing lanes to towers becomes stronger, too. However, your ability to heal allies will be less powerful than that of healing-oriented Voltars.
Drones - Drone Army, Weaponised Hull, Warpgate Overdrive
Healbot - Energy Drink, Turret Add-On, Hydraulic Sugar Dispenser
Healing Wave - Happy Thoughts, Psychokinetic Repulsion, Euphoric Thoughts
Voltar - Med-I'-Can, Piggy Bank, Power Pills
Start: Piggy Bank, Power Pills, Warpgate Overdrive
1st: Weaponised Hull, Drone Army
2nd: Turret Add-On
Afterwards: Adapt to the battle.
Play Style and Tips
The first Drone type build focuses on triggering the drones in the right moments. With all upgrades, the drones become an extremely lethal hinder of the enemy, with well timed explosions dealing up to 80 damage. Drones will 'rubberband' behind you, which can make controlling the drones tricky. When drones are off cooldown at that moment, the next set of drones will be immediately released. The drones cannot be self-destructed for about one second after summoning them, though. Don't be afraid to trigger your drones to destroy a wave, the drones can be resummoned in just 6 seconds.
The Turret Add-On simply allows you to use it as an offensive tool too for additional damage.
After the main damage is purchased, see how the battle progresses. The remaining Healbot upgrades help both your damage and your team; Your team can heal at your turret for a longer period of time. If the enemy pushes your towers a lot, you can grab a Psychokinetic Repulsion upgrade to have a better chance at saving towers. The other options can be a personal choice, but increased healing helps your teammates survive better.