It is very easy to read and I personally think you handled the vertical format perfectly and I never had a hard time reading the comic and with what I have seen so far I like it. I like that we have a nurse protagonist which I find interesting(personal bias). Keep it up I want to see what happens.
My personal grip is more to do with the art style, which I personally find the colors a little too bright for something that's going to be a horror, and this is more of a nitpick I'm not too crazy on the art style I find it a little to similar to the standard webtoon style for my taste, which I am not a big fan of, but I as I said that is a personal grip and didn't interfere with my enjoyment. Its too early to tell 100% where its going but I'm interested. Keep it up.