Whilst I haven't played many games of the Point and Click genre, I do know that the game Scratches has a much bigger map than this one. The voice acting is good, and the graphics aren't too bad but certainly not top notch either. You may find the fonts used throughout the game (even on the main menu) offputting as they don't blend well with the game or interface in my opinion.
I bought it at a discounted price, but to be honest I am having trouble deciding whether or not it was worth that. The storyline was good but, leaves a lot to be answered as we never do meet the girl who is the 'damsen in distress' throughout the entire game. That being said though, it has an interesting theme and I did enjoy the puzzles for the most part.
As for the horror factor, there were a couple of parts that made me jump but it's not really a scary game. The music throughout was sub-par, but bear in mind this may have been made on a small budget.
In conclusion, if you like point and click games Rhiannon: Curse of the Four Branches has some tricky puzzles, and will be worth picking up at a discounted price. If you are looking for horror, this is very mild at best. And if bad fonts bother you, I wouldn't go for it. Still, I'd recommend it as I managed to finish the game and the story is fairly thorough.