If Inscryption generated the same gross revenue on the Epic Games Store, Daniel Mullins Games would keep approximately $43,842,168 - that's $7,078,957 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $5,842,114. 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 $34,778,997.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.