Hellsound Dreams is a horror themed mod based on Nightmare House 2 mod source code.
Well designed yet sparse on information regarding navigation and problem solving, many of the puzzles had to be traversed via noclip.
Simply put, there was far too much puzzle solving in this mod and it really broke the flow of the gameplay. Even though I did figure things out on my own near the end, I still felt like I was backtracking far too much.
Overall, it's not terrible as the modder has a keen eye and definitely a talent for modding, it's just that Hellsound missed the mark gameplay wise.