『ぼくのなつやすみ』or 'My Summer Vacation' in English is one of my favorite games of all time back in the PS1 (I think I still have the PS1 CD, lol!). It's about a boy spending his summer holiday with his relatives who live in the countryside. How you want to spend your time is up to you: meeting new friends, catching butterflies, bugs, etc., exploring the beauty of nature while discovering some secret of the area.
It's a very relaxing, slice of life kind of game.
Shin chan: Shiro and the Coal Town is basically based on that concept, but with added some of their own, such as it has a proper story, main and side quests, etc.
If you're looking for something soothing and relaxing, and especially if you love Shin Chan, you will enjoy this one.
https://steamcommunity.com/sharedfiles/filedetails/?id=3353605772