If Remember Me generated the same gross revenue on the Epic Games Store, DONTNOD Entertainment would keep approximately $11,182,013 - that's $2,254,161 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $1,388,456. 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 $8,799,328.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.