This is my favorite VR game and I own almost all of them (sans PSVR). People think I'm crazy when I say that, but not anyone who has played it.
It comes down to the fact that it recreates minigolf perfectly while allowing course designs to expand beyond the constraints of the real world. All the courses could exist in real life, but they would be logistical nightmares.
It's a combination of something very familiar but pushed to amazing limits. This is a must-have in anyone's VR library.