If EZ2ON REBOOT : R generated the same gross revenue on the Epic Games Store, Neonovice Co., Ltd., SQUARE PIXELS would keep approximately $6,032,255 - that's $1,329,325 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $686,217. 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 $4,702,930.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.