“When I first played Earthfall on overwhelming it felt impossible. Enemies came from all kinds of crazy locations, there was always something to shoot, loot seemed far and few between and all it took was a couple specific enemies to cause a wipe. While this holds true, even for the best players, its not as hard as you might think. With a couple tips, tricks and helpful tactics, it is actually fairly doable, assuming you have a mic and/or can get friends to help. This is important, since the AI, even on masterful, is great until it isnt and will not make the clutch plays needed to beat overwhelming.” – JPS

Source: N4G PC Earthfall – Overwhelming Guide