- Turrets — a rare, stackable ally from the shop. Each one telegraphs in with a flashing green X, auto-fires at enemies, and jumps to a new spot every wave.
- Engineering — a new stat that boosts the damage of all your allies, the Tater Tot and turrets alike.
- Six new shop items: Toolbelt, Drone Uplink, Power Diverter, Scrap Cannons, Lone Operator and Cold Snap.
- Shotgun Lemon — a new ranged enemy from wave 11 that fires a far-flying shotgun spread.
- Watermelon Smasher — a new heavy enemy from wave 21 that winds up and slams a marked zone, knocking you back.
- Damage Numbers toggle in Options.
- A "NEW" turret banner on the main menu.
- Volume and Speed sliders can now be clicked and dragged, not just stepped with the +/- buttons.
- The "Reduce Effects" option now also hides the fire on burning enemies.
- Balance — Shuriken damage reduced by 30%.
- Balance — the Tater Tot and Turrets now show up a little less often in the shop.