Extremely overexaggerated thumbnail...
Do NOT do what I do and waste your harpoon gun shots on infantry/fodder enemies, use it on gunners. And be careful with intraplanar device bullets, they can help you even in the most dire situations... and even be a replacement to harpoon guns stunning ability.
Somewhat edited so don't expect completely smooth gameplay.
Also some dev/qa testers were in my lobby so expect gameplay to not be 100% normal (e.g Nerferer and Toad_TheFungi)