Someone's been talking on the IF forums recently about games that don't have involved puzzles or deep narratives, and I think this is a good example of how to make a successful game without worrying too much about these things.
This is a small adventuron game with a compact, 3x3 map. There is pleasant music, pixel art with lots of abstract triangular textures, reactive NPCs, a variety in types of interaction, and some fun responses to player actions.
It's a simple game, designed for the text adventure literacy project, and I think it's done really way. I don't think it has much in the way of replay value, but other than that it is a rewarding and fun short game.