Hey!
Opacity is a nice and creepy little game, it made me think "horror pacman" since I'm going around collecting crystals like that haha
I like the body parts laying around and already without anything else happening it creeped me out to be careful around the corners. I wanted to say that the movement was a bit weird since I could only move in one direction at a time, which is probably just the developer still in the learning process of gamedev, but then that kind of walking made it harder to look around the corners and that made the game a little bit creepier, so I don't know how much of it was intentional, but I found it to be quite unique.
The story is simple enough, I like what the creature looked like too, I saw it barely twice in the whole game, but even then it was a dark silhouette and I think it kept it more mysterious that way.
Good stuff!