ENDING SPOILERS BELOW
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Thanks for the suggestions!
To give you more feedback: The branching paths and the "meta" layer of going back to find 'the space between' were fantastic ideas. These puzzles remind me of playing the game 'The Witness'
I completed it the recommended (?) way, and I'm glad I didn't find the second path (15 > 28) to the ending which would skip a puzzle or two. I wonder if a 3rd path could be created from using the unused letters from all of the puzzles combined.
I wish I was more careful when checking my answers in the dictionary, as I spoiled at least one answer by seeing a future word in my peripheral. The word descriptions were great BTW.
I felt one word was unintuitive (finis) - every other answer created a commonly known word (except gae but there was an alternative). Overall, would highly recommend.