Finished! I think my favorite puzzles were Going in Crop Circles, Now Wh??e Could My Pipe Be?, Talking in Circles, Old Viking Times Games, and Shot Heard 'Round the Multiverse. (I would say more but I don't want to spoil people.)
The answer check for Th? Arbo?etum seems broken (as of my writing this comment). Less importantly, Deceitful Deities is misspelled as Deceitful Dieties in some places.
Woah! That was so fast! Glad you enjoyed it and tysm for the bug reporting, was bound to have some with all the typesetting needed. If you want to share more, feel free to send comment in ROT13 speak, just with a disclaimer like (Spoilers for X/the whole hunt) at the start. At least that's what I usually see ppl doing in itch comments.