Please, please give me advice on this, I know I fail at marketing and would love the help.
Mystery House, an adventure-horror experience with eerie, lo-fi visuals where you must escape from a mansion home to an alien-worshiping cult.
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I would focus more on the alien-worshiping cult part. "Eerie, lo-fi visuals" is just telling people that the game is scary. So is "adventure-horror experience," although that's excusable because it describes the genre of the game. It's better to show people a detail of the game that will get them intrigued and wondering what the game is like than to just tell them what the game is like.
I guess just an interesting fact about the game? Something about its story, or its mechanics, or anything really, as long as it's not obvious. So if I say my game is a puzzle platformer, that's pretty boring, but if I say it's about the struggles of a ghost trying to be an adult, that's a lot more interesting.