Thank you for this great and massive campaign, which I have just finished.
After my issue with the oddly behaving Sacred Crops scroll in mission 2 (see my posts on page 1), which I think is a bug of some sort, I wrongly thought there was also a bug with the shrine entrance receptacles because they weren't highlighting or responding when I put items in them. Once I had re-read the poem all was good.
I think I also only managed to find two secret areas in that mission,
Someone has mentioned that maps would be useful. I agree. If players want to explore without looking at them they can, but towards the end of a couple of the missions it was frustrating to needlessly revisit places because I didn't know how to get to the place I actually needed to reach.
Other than that, great work. Thank you.