How often do you jump in this game?

[Oichi]

For getting across terrain, I jump a lot.

As some others have said, it also works as a universal "acknowledgement" emote. It can be "thankyou", "I'm ready", "we did it!", "come this way" or anything that would be assumed in the context.

(I still remember playing the game Journey where your only way of communicating with your companion player was to jump or chime at them. It worked quite well.)

I loved the fact that you could only communicate in Journey by jumping and chiming. Worked wonders. Beautiful game