Glad you enjoyed it!
Yes, we made a decision early on that we wouldn't hold back the main story in order to implement the game mechanics we want. They're well underway and we've already invested a few thousand dollars into assets for it, so it's definitely still coming.
Some fun new art we've got recently
Our current plans are to implement it for the entirety of Vol 1 for our first release, but we want to make sure it's fun and positively adds to the experience before we put it out into the wild. But we're not in any hurry, there are still years of development left in the main story of OoT and I'd much rather get it right the first time instead of having to make excuses for shit gameplay.