If Vagante generated the same gross revenue on the Epic Games Store, Nuke Nine would keep approximately $1,980,376 - that's $500,531 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $133,688. 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 $1,479,845.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.