If Flashing Lights - Police, Firefighting, Emergency Services (EMS) Simulator generated the same gross revenue on the Epic Games Store, Nils Jakrins would keep approximately $9,833,584 - that's $2,054,961 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $1,204,580. 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 $7,726,714.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.