The latest game to make their way to the Epic Games Store as an exclusive title is Atari's RollerCoaster Tycoon Adventures. The game was originally released for the Nintendo Switch late last year, and it appears Atari made the call to make the PC version exclusive rather than sell it on Steam or GOG. Here's a quote from the company on the decision and release.
"We couldn't be more excited to partner with the Epic Games store to bring this new casual entry in Chris Sawyer's beloved RollerCoaster Tycoon series to its birthplace on Windows PC," said Jean-Marcel Nicolai, Chief Operating Officer, Atari. "RollerCoaster Tycoon Adventures is a fantastic entry point in the series for players of all ages and skill levels, and it's now further accessible to fans on Windows PC. The Epic Games store is a fantastic new platform for creators and players alike, and we're honored to begin our support of it with RollerCoaster Tycoon Adventures."
You can get the game right now on the Epic Games Store