Blackwell Unbound is a prequel to The Blackwell Legacy. It is a point and click adventure, and sticks to the usual control scheme and playstyle of the genre.
In Blackwell Unbound, you play the aunt of the protagonist of Blackwell Legacy. Since this game sort of jumps in to the middle of a relationship between a medium and spirit guide, it is helpful to play the original game first to get some explanation on what is going on. With the help of Joey Malone, a ghost from the 1940's, you must solve mysteries and help lost ghosts find their way to the spirit world. It is a nice shake up of the usual detective story dynamic. While you still must look for clues and interrogate witnesses, you are doing so with the help of a ghost. You can switch from time to time between Lauren and Joey, the ghost, to help you advance. Certain things can only be done by Joey, such as moving through walls or talking to other ghosts in the real world.
Blackwell Unbound runs a good bit shorter than The Blackwell Legacy. I really enjoyed the notebook functionality in the first game, but found it a little lacking in this one just due to the overall shortness of the game. This may be because while there is one overarching story, there are two distinct mysteries to solve. The first game just had one mystery that kind of led to another and so on, but the clues really built off each other and involved a lot more using the notebook to combine clues and interrogate witnesses.
The graphic style is pretty much unchanged from the first game. It is reminiscent of early 90's adventure games, which in my opinion have aged better than games from the late 90's and early 00's that begin using 3D. They look well enough, but they are really lacking in detail. It's ok to use that style, but I'd like to see it sharpened up a bit with some more detail added overall.
The voice acting is much improved, with only small complaints. The main character in particular sounds so much better. She sounds engaged in the story, while her predecessor sounded a little bored. Joey sounds the same, which is neither great nor bad. The main villain sounds pretty terrible in Blackwell Unbound. It really kind of removed me from the story. I think you will understand when you hear it.
Overall, I actually enjoyed this more than Blackwell Legacy. While it was a little shorter, and I missed using the notebook as much as the original, I found the overall improvement of the story and voice acting won out. I really like this main character more, although I'm not expecting to see much more of her. I will definitely try out the next game in the series, and recommend you give this game a look.