This is an interesting scenario with a lot of potential. It feels like a framework for a bigger story.
I'm not sure how much distance is between towers and how much time is required to travel between them. Time seems like a valuable resource in this scenario.
I wonder how frequently characters will engage the creature before it can topple towers. It feels like a race stacked against them, especially in a situation of lacking information. I sure hope players spend their few questions wisely. Frankly, I'm not sure what depriving players of information accomplishes in this situation as it robs them of motivation to stop this creature, which will be hard to defeat, even if manage to weaken it.
There is so much damage flying around in this scenario that characters are certain to die, which isn't unfounded in Mork Borg, but I'm afraid it would start to feel hopeless very quickly. The apathy mechanic for instance increases the already high miss chance in Mork Borg which I would find more frustrating than fun as a player I think.
Is the time between towers meant to give characters a chance to heal before the next encounter due to the deadly nature of each one?
I'm not sure why you decided to use the Troll as a reference here since you removed its healing ability and the amount of text to accomplish the troll reference and the negation of the healing ability is ample room for including the HP, morale, attack, etc that would be more useful on the page than having to have the book open to flip to.
All my thoughts aside, using this for my players who have been playing the same characters for quite a while and have several Getting Betters behind them, might find the difficulty here a delightful challenge.