The short: if you like back to back puzzles, with little to no story or narative, buy this game.
The long: it's a very straight forward find it game. i havent had some of the crashing issues as others have had, so those may have been fixed. The puzzles are challenging enough that they will make you think a bit inorder to solve. And i like the overall designs of the people and environment. And the design for the "secret weapon" in particular was really awesome, but thats about where it ends.
There is very little to the story. direction is follow the little sparkles and arrows, and there is almost no dialogue while moving from one puzzle to another. I feel like there was supposed to be more after where it ended. The ending was so sudden and at a crucial turning point. I thought i had missed a trigger inorder to continue, but since there is zero backtracking in this game i would assume not. afterwards i was just left with unanswered questions. So much infact i wouldnt be surprised if this was made to be a two-part game, but there are no indications of this other than the sudden stop. Are we supposed to assume Abigail used the "secret weapon" to defeat her uncle? Where is he keeping her father and this undead army hidden? Also the story in general made me feel like someone took a bad fan-fic of the prologue to Hellsing the anime.
As for the puzzles, yes they were challenging at first, but when you reuse the same puzzle with some different tiles, or make them a little longer, that is bad design. Also, many of the puzzles feel random and have little to do with their surroundings. There were some unique puzzles to this game and I feel like they could have done more with them to make them stand out.
Finally, there is minimal amount of interacting with the environment. i think the most i had to do was use a key to unlock some doors and a screwdriver to unscrew a vent to find a key. some items you find in this game simply disappear, like the one that tells you how to navigate the catacombs (kinda important)
All in all this game made me feel lacking. There was so much more the devs could have done. it was if i asked for a ham sandwich and all i got was two pieces of bread. all filler and no flavor. I wish this company good luck in their future (relative since this game has existid since 2011) endevors but this game was just lack luster 4/10