This is well-implemented, with introductory screens, nice transitions, and the course look before each hole. Lots of polish, which is good to see! The gravity flip mechanic is fairly common in platformers but I've not seen it in this sort of game, which is a nice change. I took a couple of holes for me to grasp what it means (that you can do a simple soft hit and let the gravity change do most of the work, most of the time!), and "hit the ball a small distance" is frustratingly difficult because by definition the ball has to at least swap from ceiling to floor or vice versa on every hit. The later levels having the flag in its own little valley was helpful, though, and much welcomed!