There are other mini putt games out there. Mini Putt 2, and Mini Putt 3. But they suck. The one that comes closest to capturing the feel of the original is a Holiday themed version: http://www.miniputtgames.com/holiday_mini_putt.shtml This one is a bit tougher. Probably won't see too many 17s on this version.
You can find them here: http://miniputtgames.com/ But don't come crying to me when you find out that they are not worth the effort.
This, from the Golden Tee guy? 51 first try, 37 best. There are a couple holes in there (both with hills) that I don't know how anyone gets a hole in one on. They take me about four each at best.