I would say that if you loved Harvest Moon (particularly old school games) you will really love this one, as it is Harvest Moon only much bigger and more complex (plus the dev plans on continuing to expand the game post release).
Mud I'm not sure why you think the game is for 5 year olds. The game actually has a lot of depth and complexity to it. The graphics are intended to be reminiscent of the NES/GBC days. Also the game has a number of mature references to it, like finding the mayor's 'shorts' quest for example.
In this game you can grow crops, raise animals, become a logger, make different artisan goods, mine metals while fighting monsters, build the farm however you want, forage for stuff to sell, do quests, have relationships, get married, have kids, crafting and cooking, fishing, and a lot of other stuff.
The game right now has a 10/10 review score from 6,248 reviews on steam.
Anyhow here is a review for the game.
https://www.rockpapershotgun.com/201...valley-review/