Instead of grenade jumping at 9:30, you can jump from the fence on the other side to get to the pressure plate on top of the stacked containers (I checked the map definitions)
The spores in the Cassius fight actually give you a significant boost to your damage as long as you're in them. Just don't let the bar fill up or it does kill you
Using the bee shield with a shotgun isnt as good as other guns, i see you using it all the time but the damaged is split between all pellets so a shotgun will do the same ammount of amp damage as a pistol but unlisted pellets like the fibber, sandhawk or harold all get the damage.