Hi! Thank you so much for your kind words. In answer to your question about whether I choose words or write poems first, the answer is a little bit of both! I've done a couple of these collections now (and intend to do more), and I usually start with a number of poems that I write beforehand. Once I throw those into Twine, I'm able to more easily see which paths might need more fleshing out/which areas and ideas in the collection could benefit from more writing. After I've done that I usually pick a few words within the poems in those areas and try to spin those out into additional poems that fit the theme!
Thanks for your suggestion about a table of contents, that's actually something I've considered in the past but haven't implemented. If I put them in in future collections they'll probably only be accessible after the "player" has found everything (since part of the fun of designing/writing these collections for me is the inherent uncertainty for the reader that they've seen everything; even I forget what's in them sometimes), but I'll definitely take it under advisement!