The title itself offers strong clues:
Recorded using high-end dummy head microphones to create a 360-degree soundstage, making the listener feel as though the speaker is right next to their ear. Sleep Induction:
"Nemuru Koneko" appears to be a standalone game, but it is part of a broader catalog of work from its developer, Nichanicha Soft. The DLsite page for the game also suggests other titles with a similar "simulation" style and theme, such as "30 Days with a NEET Little Sister" (不登校妹との30日間) and "Playing with a Sleeping Little Dancer" (すやすやおどりこいじり). Fans of this title might find those other works appealing.