Earlier quoted context omitted.
I would say my puzzle game ( http://itunes.apple.com/gb/app/combination/id300288142?mt=8 ). It got good reviews from people who played it, a good review on ArsTechnia ( http://arstechnica.com/apple/reviews/2009/04/minireview-comb... ) and was 99 cents. I only sold a couple of hundred, and after months of trying to get more publicity and sales I gave up and made it free.
It is a lovely little game. I think the first problem is in your marketing script. You call out negatives (doesn't have plot, soundtrack, etc) right away. I actually was expecting a silent game from this. Instead it does have sound effects, even if minimal. Regardless I don't think drawing attention to the negatives helps you. I also think the hole and wall graphics aren't helping sell it - they don't 'fit' all that…
One day I'll hopefully manage to make a new game, with both parts done well.