there’s an info post about this on plurk, but i’ll try to relay the info the best i can:

• so if you’ve played a harvest moon game or two, you’ll recognize the company natsume. wikipedia lists them as a developer for harvest moon. this is not true.
• natsume is the localizing company for the harvest moon games - and they’re pretty bad at it tbh, considering all the translation issues and the bugs the games have. the actual harvest moon series is made by a company called marvelous.
• marvelous recently ended their contract with natsume, and gave the rights to the series to a company they recently acquired, xseed. you might recognize them from corpse party and a few other games, but most notably, they were the company behind rune factory frontier and rune factory 4.
• BUT.
• natsume still holds the rights to the title “harvest moon”.
• so while they don’t have the rights to the games anymore, they could still make a game and call it a harvest moon game.
• which is exactly what the lost valley is. it’s a shitty knockoff farmsim made to trick people into buying it because it says it’s a harvest moon game.

TL;DR - DON’T BUY IT, NATSUME IS TRICKING YOU INTO THINKING IT’S A NEW HARVEST MOON GAME. if you really love harvest moon and want the next game, please buy xseed’s “story of seasons” game, that’s the actual next game in the series.