Backrooms (the movie) is based on the backrooms(a collection of of internet fiction written by a lot of people in a shared setting with a shared premise), which was inspired by a lot of things because the concepts behind it were built up by a lot of people. House of Leaves probably had an influence because it’s decently well known but there is no direct relation. I’m sure if you dug through some forums, boards and subreddits you could find someone talking about a direct inspiration for a piece or two, but it’s not really a formalized set of works