Regardless of your current tier, specific upgrades are considered game-changers:
They are vulnerable after attacking. Move in the opposite direction of their spear to dodge stabs. Clone Drone in the Danger Zone by sets
Focus on Armor and maximizing your Clones to handle the influx of Mark 5 robots and Fleet Analysis Bots. Essential "Must-Have" Upgrades Regardless of your current tier, specific upgrades are
Maximize the Bow (excluding Arrow Width 2 to keep accuracy against Laser Raptors), Aim Time, and 1 Clone. Regardless of your current tier