This might sound a bit random, but Cyberpunk 2077 has this sort of warmup sound that plays through the game startup sequence that always gets me relaxed or psyched up to play. Another example is the title song in Trails from Zero. Calms me every time.
Whether it’s a sound effect, music, or a loading screen, is there a game that does this for you immediately when you open it?
Played through it with my husband, usually on an evening after work, and discovered that no matter how stressed or annoyed you are the Outer Wilds intro / menu is just instant relaxation. Like sliding into a whole other world where everything is going to be ok.