If Tiny Bunny generated the same gross revenue on the Epic Games Store, Saikono, Sokar would keep approximately $4,951,411 - that's $1,108,243 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $538,829. 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 $3,843,168.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.