The coded message from Omen means: You've been here before...Remember?
Tips/Things I noticed (based on how I beat the game, so it might not work):
Use only the Football players and the Ghostbusters (for Tank and DPS purposes 3:1 ratio)
Prioritise the level of the DPS.
Stay away from the Asylum patients, because they don't really fit into neither archetype. (They just die too easily compared to the Football players)
Never reroll anything!!!
While using spells at the start it is preferable to use the pause, to minimise the cooldown/movement.
Having multiple stagger beetle items increases the chance of survival against bosses. (especially the last boss)
The Sorcerer spell passive that increases spell range is absolutely necessary, because it is basically a 5x multiplier to a buff spell.
If the boss is close, prioritise it first! (If not then good luck!)
The most important classes are:
The Druid - extra HP;
The Sorcerer - extra DPS;
The Monk is also neat for the dodge.
 "Underboard: Omen"){kind=icon}
 "Snakes On A Cartesian Plane"){kind=icon}