If Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad generated the same gross revenue on the Epic Games Store, marbenx would keep approximately $267,219 - that's $80,166 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $0. 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 $187,053.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.