Shy Boy appears as the main threat in the beginning, rushing to your base immediately after the battle starts.
Those Guys and Doge Dark appear as peons along the way.
Squire Rel appears as a distraction during the boss wave, where 2 more Shy Boys come out after hitting the base.
Ita somewhat like Wanted Night but with stronger maginfication
Be prepared to spam your meatshields to prevent Shy Boy from damaging your base too much. Personally I used Cyborg Cat to knockback the Shy Boy and subsequently spammed Anti-Red and Anti-Floating Cats.