As a big fan of the works of Lovecraft, I found Dagon to be a fantastic, immersive and faithful interactive retelling of the short story.
The voice acting was excellent and the audio ambiance framed the narration very well.
In terms of gameplay, there isn't much. And Dagon did not set out to be more than being, as written before, an interactive story which takes about an hour to finish. You click to proceed through the events - there are no puzzles, no action scenes, no decisions. However there are tidbits of trivia hidden in many of the scenes, which sometimes take a keen eye to uncover. And for fans of Lovecrafts work, these are really, really cool.
All in all, I thoroughly recommend Dagon for fans and those who might want to become one themselves. For the asking price of FREE, you can't do anything wrong here.