Thats true for every game, really. Don't buy anything based on planned or promised features. I disagree with your wording, however. He kept patching it long after it went gold, so I wouldn't have considered it 'abondoned'. It was the very first effort from a single developer and he just ran in to a lot of snags and issues an publicly said he was moving on.
Im not sure why people took it so personally. It was a good game and I spent a lot of hours enjoying myself. So what if some originally-planned features didn't make it in? it was still better than A LOT of games out there.
Just my two cents.