Heart of Darkness doesn't show or tell you what the actual horrors are, as far as I remember. Isn't it kind of psychological horror that only hits you after you

Heart of Darkness doesn't show or tell you what the actual horrors are, as far as I remember. Isn't it kind of psychological horror that only hits you after you finish it and then start really reflecting on what probably/possibly happened? I think it's a bit of a weirdly paced novel though, and from recollection it's really easy to miss certain implied meanings if you miss a single sentence or so towards the end.