If Door Kickers 2: Task Force North generated the same gross revenue on the Epic Games Store, KillHouse Games would keep approximately $6,110,075 - that's $1,345,243 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $696,828. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $4,764,832.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.