The Delaware St. John game series, of which this is the first chapter, has three great strengths: beautifully painted visuals, characters you come to care about--and stories that get creepier the deeper you get into the game. Fans of adventure games and gentle horror will find a lot to like here.
Beautifully painted visuals have, however, a drawback; they are difficult to animate, so games that feature them, like this one, and like Myst, represent motion through the world by cuts from one visual to another. And in addition, they provide first-person views, and try to avoid representing other characters on-screen, since that's hard to animate in this environment. Myst solves the problem by providing an unpopulated world; the Delaware St. John games instead have the eponymous protagonist explore abandoned (but haunted) places. Delaware does Myst one better, however, by having the protagonist's friend, Kelly Bradford, available by cellphone--she can do online research from her computer, and provide hints. So unlike Myst, the Delaware games have a degree of enjoyable character interaction and banter as well.
Check out the second game in the series, too.