If Farm Together generated the same gross revenue on the Epic Games Store, Milkstone Studios would keep approximately $9,361,770 - that's $1,985,262 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $1,140,241. 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 $7,351,408.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.