If Record of Lodoss War-Deedlit in Wonder Labyrinth- generated the same gross revenue on the Epic Games Store, Team Ladybug, WSS playground would keep approximately $3,204,102 - that's $750,839 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $300,559. 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 $2,453,263.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.