Dorfromantik is a great example of a well defined, highly polished, relaxing game. It reminds me very strongly of the Carcassonne board game where you have to place tiles on a board, and the edges have to match the others around them. Here you're allowed to place them wherever you like, but you score more points (and extra tiles) by placing them correctly. As you place tiles, some of them contain "quests" where you have to build fields of a certain size, rivers of a certain length etc. There are also new tile types that unlock once you reach certain score milestones. It has a lovely relaxing soundtrack, and is really pretty to look at.