Link to the game: https://hanifanims.itch.io/elemental-dreams
In this game, you play as Yousotsuki, a 14-year-old boy who loves nature. But one day, a series of natural disasters struck, causing him to lose his entire family, with only him surviving. Since then, he has begun to question whether nature really loves him or not. He then decided to go to an uninhabited place and stayed there for who knows how long to find peace and quiet and be closer to nature. He had nothing to do but sleep and explore dream worlds of elements.
This game is heavily inspired by Yume Nikki