For instance, legit fun fact: the one and only time I've been scared playing a video game, it was a kongregate game that was doing the scaring. There's point and click horror games that are just so atmospheric that they actually send chills down my spire and I get legit terrified during them. I have to get the right mood of, "it's just a game it's just a game" because they get me so invested that I actually get scared.
Mind you, some of that fear is born of "if they have a mechanic to kill me...how much progress will I lose?", not to mention, how many tries will it take for me to do this without being killed, butstill. Good horror games actually exist on kongregate where the horror isn't gore, where the horror isn't in monsters, isn't jumpscares, isn't a bunch of other cliches of the genre, but where you build investment and interest in both your own character and the world around where there's a lot of time where there's no sense of imminent danger--so that when you want to give the scares, the sudden sense of danger is all the more horrifying.
Basically, if you have a sense of danger where none exists, it can work but usually won't; if you have a constant sense of danger, it'll never work; if you have no sense of danger when danger exists (jumpscares), that's cheap and isn't real horror; if you have no sense of danger when none exists, but suddenly during the parts where there is danger, you can sense it...
...That is horror, and those are the kinds of games that are so good that I am legit scared of playing them.
And there's a few of those, too.
Butyeah, I knocked out about ten games, and even finished a quest! (And due to my absolute stubbornness, nailed one of the two hard badges as a bonus for a game--the other hard badge should frankly be rated as an impossible one because even if you had a walkthrough, which none exist as far as I know, it wouldn't REALLY be possible to get because it requires absolute precision of a ludicrous nature.)