Feedback:

Gameplay is good and aesthetic is sufficiently Halloweeny. The only (personal) complaint I would have is that this map can be a little dark near robot spawn, specifically the tank entrance. Higher visibility where RED will first see the bots would be a good change imo.

Examples (sorry for the HUD):
https://i.imgur.com/4tGADQ6.png
https://i.imgur.com/FgMK48J.png

No strike

Demo: https://testing.potato.tf/demos/mvm_underworld_rc2_adv_subterranean_animism-1630279139.zip

Lineup:
Scout (Package O' Lies)
Soldier (owo Inky)
Pyro (Lemony)
Sniper (Perp)
Medic (Skin King)
Engi (washy)

W2:
Cut a squad at the end, when pushed they straggle

W5:
Giant squads at the end of the wave could have more common support
Flare Rain could be buffed (Lemony)

No strike

Demo: https://testing.potato.tf/demos/mvm_kelly_rc1b_adv_awakening-1630273848.zip

Lineup:
Scout (I forgot)
Demo (Bazooks)
Pyro (Skin King)
Sniper (washy)
Medic (Regi Jazz Man)
Engi (Lemony)

General:
-Tone down uber med difficulty spike
-Remove the lightning flash effect
-Perhaps add some sort of sniper counter to the mission (check demo to see what I mean) (Lemony)

No strike

Demo: https://testing.potatomvm.tf/demos/mvm_traumatic_b1a_adv_terrorstorm-1627869187.zip

Lineup:
Scout (Lemony)
Sniper (watermelon)
Pyro (A+drew)
Soldier (Katzenwerfer)
Heavy (RC Polygons)
Engi (Dratbil)

W2:
Infinite sandman support is kind of annoying (Lemony)

Strike 2
Do public testing and incorporate feedback before submitting your mission for judging. In it's current state this mission needs a lot of work if it is going to be approved for the campaign.

Demo: https://testing.potatomvm.tf/demos/mvm_underworld_rc2_exp_demonheim-1626923183.zip

• Scout (A+drew)
  
• Demo (Lemony)
  
• Soldier (CreatorForce)
  
• Heavy (Braindawg)
  
• Engi (washy)
  
• Medic (gettysburg)

• This mission is boring/unfun to play and feels more like an Advanced than an Expert (especially W1)
  
• Heavy still dumpsters on this mission
  
• Add ZombiesNoWave666 1 to your popfile (A+drew)

• Replace Crit-on-Kill Deflector icon with something better
  
• Fist of Steel subwave is boringly easy and doesn't seem to have a purpose
  
• Short for a three wave mission (A+drew)

• Replace Tomislav with heavy_giant or the Lite's accurate Heavy icon
  
• Replace Iron Bomber icon with the Burst Demo icon
  
• Use Valve Bonk Scout icon
  
• Spies do not need a speed boost or 75 health regen
  
• Tank is too slow (CreatorForce)
  
• Why are there Jarate bots paired with Crit-on-Kill bots (gettysburg)
  
• Runescape music during Pyro boss is too long and doesn't fit TF2 (A+drew, gettysburg, Lemony)

• Minicritters are really annoying filler support
  
• Shield Medic needs IgnoreEnemies (Braindawg)
  
• Bosses are ridiculous with their damage bonus and explosive radius

No strike

Demo: https://testing.potatomvm.tf/demos/mvm_bigrock_event_exp_impending_apocalypse-1626919255.zip

Lineup:

• Scout (A+drew)
  
• Demo (washy)
  
• Soldier (Lemony)
  
• Pyro (Braindawg)
  
• Engi (CreatorForce)
  
• Medic (Preponderante)

• Remove crit outline from Kritz medic
  
• Spellcaster DFs can use the normal DF icon
  
• DF subwave could be toned down a little (Braindawg)

• DH Soldiers don't need a separate icon

• Giant Spellcasting Homing Soldiers don't need a separate icon
  
• Knockback from the rockets of the Giant Spellcasting Homing Soldiers is a bit much (Lemony)

• Tank near beginning of wave might be a little too beefy (washy)

Not announced yet.