Kingdom Rush Vengeance: Clockwork Factory Instacall Impossible NLL - no Hero no Sell 12 Soul Points

Only 12 star upgrades used here because that's all you have by the time you unlock this level. Pretty tricky early game. Not much gold given and there are two separate paths with multiple different entrances that enemies come through. Barracks are extremely important here early on because you can put your ranged reinforcements behind them and they’re your only source of damage on the left side for the first few waves.