Pretty good, but very difficult.
Wow is this hard! I played many times before I was able to beat the second level. Then when I saw the third level with it's tiny little floor bits, I knew I was doomed.
It'd be great to be able to see a little more of the play field by being able to zoom around or with a map or something. I assume the plan was to force peope to replay a lot because there is a good chunk of trial and error on the levels. For me, however, I could only take so much of the repetition of replaying levels one and two just to find out what the heck is on the upper levels.
Oh, and I think the ball tends to roll a long way. It rolled off the edges many times when I though maybe, just maybe I was finally going to make a darned putt.
Overall, this is a well done game, mind you. It's just really tough.