I'm looking to run an semi-eldritch horror game in a really

Well, here's the thing.

Horror works as a genre based on tension. Tension comes from structure, whether that structure is compositional (Dutch angles baby)
or plotted (they get killed in dreams but you gotta sleep eventually baby)
or thematic (we're insignificant specks in a massive universe that doesn't give a shit about us, also Cthulhu and weird racism I guess)

As such a lot of the systems people use to let the PCs tell their own stories (5e, Pathfinder) don't lend themselves well to this kind of tension. That's the biggest argument against whatever system it is the Arkham horror games run on, I don't remember. (see: that pasta where the dude fails his sanity roll about the two-legged dogs and throws himself into the furnace)

My advice for you would be, if you're looking for something low-crunch and easy to pick up, evaluate the story you have planned (which, you should have a story planned-- horror is the only genre that I think railroading is kind of necessary for a compelling campaign) and homebrew something simplistic that informs the need of the story.

So what's the basic gist of your plot in your own words?

>>54363843
Same anon, elucidating: 5e doesn't work for horror without a lot of railroading because
1) it puts an emphasis on player agency, where horror as a genre is fundamentally informed by a LACK of audience/player agency. Think about every time you've KNOWN the character shouldn't go into the basement to investigate the noise, but they do anyway. Or, even more pure: the nightmares where you're running and running but you're not making any progress...
2) because those systems rely on random chance, which WILL undercut both your plot and any creeping tension you manage to create in your session. Imagine that character creeps slowly down the stairs, only to critically fumble and go tumbling down the steps like a slapstick routine.

>>54363593
Thanks OP, I'm reading the Wake now and it's really cool!
For horror games, I quite enjoy Fate; it's easy to learn and fast to play, and also easy to customize the power level of the pgs.

The downside is that it's a highly narrative system without a lot of specific mechanics, but in a horror game it's always worked fine for me.