If BONEWORKS generated the same gross revenue on the Epic Games Store, Stress Level Zero would keep approximately $15,934,931 - that's $2,956,297 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $2,036,581. 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 $12,580,059.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.