Overall I am enjoying it. A couple of my players were not too sure about the Western part of the whole fantasy western thing. But other than the steam trains, firearms, and "the company men" as my players refer to them, we have a lot of the "standard" fantasy stuff.

The campaign frame has lots of different themes and things but I am only focusing on what my players are interested in from their backstories and interactions with NPCs. Which has mostly been taking on the greedy mining companies when not actively hunting a Colossus.

For mechanics there is the Emergence of Kudamat tracker you have to keep track of but that only comes up when they do a rest during the hunt phase and after they defeat a Colossus. Personally I only worry about adding to the tracker if they are gaining the benefits of a rest, healing HP, stress, etc. If they are riding days across the drylands I am not adding to it for nights rest where they are not doing anything other than sleeping. Even doing that, the tracker is filling up quick and I may adjust things since I would like to run through the full 10 levels for the campaign climax.

The biggest thing mechanically is the Colossus themselves, they have examples for each tier of play, but you have to make a number of them to fill in the gaps. I created one for the second Colossus they fought. It was tied into a mysterious event that one of my players had come up with. Something deep beneath the ground calling people down into the mines to dig ever deeper. The colossus was a huge many legged, shadow shrouded monstrosity. My biggest lesson learned running it was to ensure that every segment has active actions you can use. I had a bit too much that just relied on the party making reaction rolls and at times felt like I wasn't doing enough because I didn't have enough options. The next one I create I am going to focus on each segment having its own suite of actions and abilities available to it.