The Longing

From Wikipedia:

The Longing is a 2020 point-and-click adventure game created by independent developer Studio Seufz. Set in an underground kingdom, the player controls the Shade, a creature tasked with watching over a sleeping king for 400 days. The Shade performs recreational activities, including reading and exploring, as it waits out the 400 days in real time. The in-game timer continues regardless of the player’s actions but moves faster if the Shade performs certain actions inside its home, such as decorating the walls with drawings.