Personally, I really really like it, and I fully intend to own it one day. Currently I just have a CD-R of it. I think its the only CD-R PCE game I have aside from the Y's IV translation, and my remix of Lords of Thunder, both of which I made myself from originals.
Its basically a deal where the monkey has a course to do through and you program his moves all at once. So, walk, jump, roll, etc and hopefully he won't fall off a cliff or get eaten by a dog. There is usually more than one way to complete a level. Its rad.