If 20 Minutes Till Dawn generated the same gross revenue on the Epic Games Store, flanne would keep approximately $3,090,302 - that's $727,562 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $285,041. 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 $2,362,740.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.