This review applies specifically to the single act version. When the second act comes out, I will make a new review.
This is a game I genuinely wanted to love, but unfortunately, I can not in its current state. For $15, it is far too short, and it has fairly little to offer.
It's disappointing, and rather mind-boggling, because the demo they released had for more to it, there was much more dynamacy and uniqueness in the demo.... So what happened to the version that is being sold? It makes me wonder if it may have had an unfortunate period of development troubles.
Currently, it is extremely short, there is virtually no exploration (getting locked in at a certain part near the beginning of the game), and of course we are still waiting on the second act. The puzzles can also be very frustrating, especially one particular puzzle involving a key that you have to find, yet it is very painfully hidden. I for one didn't notice any sort of highlighting, because it blended in far too well to its environment, and had to resort to checking through a walkthrough to find where it was.
On the bright side: The few scares it does have, are very good! The atmosphere is tense, the different entities that you encounter are mysterious, and the lore is actually quite intriguing, based Indonesian mythology. The visuals are quite nice, a little above average, but does the job well, while the game runs buttery smooth. It's quite impressive for a Unity game.
Overall, it's a game that feels like it has potential more than anything - and I hope that the developers will take advantage of the potential it has, and put more content toward it, to bring it closer to what we had seen in the demo.
My buying advice: Definitely buy it when the Act 2 and Free Roam DLC are available. But for now, wait until then.