HPL2 is both my least and most favorite "sandbox game"...
I felt like I was playing a DLC for The Dark Descent or as if I was having one of those weird Amnesia dreams where I could access other parts of Brennenburg Castle. Only this time it was not a dream. Amazing experience. The level design was very well done connecting to the original levels. I also like how there's barely any music and if there are its decayed-sounding renditions of the original music. It makes it feel like Brennenburg is a decaying corpse with no more life in it. The sound design was also good. Plus, creative puzzles, yet simple (unless you're a ******* like me...) I haven't replayed to try and get the different endings, but I will eventually get around to it when I feel the need to take a break from modding myself.
Really well-made for a first horror game.