I really like this, as an element that you can pop into any adventure I think it works perfectly, as there isn't really a hook right now. That's fine it could easily be created, or combined with some of the other entries to make for a longer story arc.

The only thing I'm wondering is what is making PCs go further down? What's the hook for them? What's driving them forward/downwards?

As previously stated really like the clear and clean layout, great style! 

I like the design of this adventure. Besides what others have already mentioned, I specifically like how one side of the room is used for description and the other is used for stat blocks.

It's simple and straight forward and I think a group would enjoy this one.

My only aching question is how the hell did that giant get down there in the first place?

I like the design of this adventure. Besides what others have already mentioned, I specifically how one side of the room is used for description and the other is used for stat blocks.

It's simple and straight forward and I think a group would enjoy this one.

My only aching question is how the hell did that giant get down there in the first place?

I love the map presentation, simple and effective. Well written and an escalating (while descending) adventure. Very well done.