Team Fortress 2, Mann versus Machine: Red Ridge

I've never played Call of Duty zombies before. Fortunately the other people that joined figured out what to do so I could bumble around and not be helpful.

Timestamps:
00:00:00=attempt1
00:06:45=attempt2
00:14:18=attempt3
00:27:17=attempt4
01:01:21=attempt5

Anyone looking to play this map, here are some tips from me:
-Engineer supremacy.
-All classes have max health set to 150.
-Weapons that increase health, including Gunslinger, don't modify your max health.
-You only keep the melee weapon from your loadout. Weapons like Half-Zatoichi, Warrior Spirit, and Backscratcher are fully functional, but melee weapons fall off in usefulness since zombies' health scales up a lot while melee damage doesn't.
-You can't equip your own pistol or pistol reskin on this map.
-Scout can double jump.
-Engineer can build a sentry and dispenser, but cannot upgrade them.
-Medic with Amputator can use the taunt to heal in an area.
-All the guns can headshot. I don't know if the explosives can headshot, but the bullet ones can.
-Don't wander off from the rest of the team as I constantly do. I was looking for things that it turned out someone else already had and died multiple times for no reason.