Tried it a few more times and yeah, the special effects from the fog seem to be causing a lot of lag, also for some reason I have to jump up the stairs, I thought maybe I was crawling but that wasn't the case. I could go DOWN without a problem, but not UP not without spamming the jump button (also noticed the stamina bar nice ;3) also if a character is chasing you and you try to go upstairs, you get stuck between the character hitting you and a invisible obstacle before the character can zero you out, you end up falling through the map and not die, you just keep falling. Oh and which button is "Pause"? It doesn't say any other except the "open inventory", but not the pause menu, so I ended up spamming a bunch of buttons until it came up.
(Thought I'd give more of an actual report than just a single comment with a bleak description and barely any details)