If The Wild Eight generated the same gross revenue on the Epic Games Store, Eight Points would keep approximately $3,425,533 - that's $796,132 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $330,754. 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 $2,629,401.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.