If This Is the Police generated the same gross revenue on the Epic Games Store, Weappy Studio would keep approximately $3,827,885 - that's $878,431 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $385,621. 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 $2,949,454.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.