The writing here is awesome. I know you've said that TBSBMD is inspired by castlevania, but I can't help but feel Bloodborne was in the back of your head, which is a good thing because Gothic horror and lovecraftian abominations go together really, really well. That is where the writing shines; the castle isn't just a building, its an alien nightmare that has been dragged kicking and screaming into this wretched world and it is not happy about it. I do like the image here are well, feels like the cherry on the top.
My main criticism pretty much echos JimJamJoshie's; reaching the top of the tower could happen in one room, or eight. Another thing I'm not sure about are the first three rooms on the table. From how I've read it, all of these force a save just through walking through the door, though they do hide some bonuses. Personally, I would have the player make a roll if they performed a certain action, on a fail the bad thing happens, on a success they get the bonus.
Of course, that just some nitpicking. TBSBMD is one of my favourite entries from this jam. Its a blood stained, nightmare crawl through a castle that is an eldritch horror tearing its way into reality. That is to say it is excellent adventure that fits Mork Borg perfectly.