I played all the way through because I was bored. I'm still bored. Sorry, but lots of standing around waiting for bridges being built and lots of running around aimlessly does little for me. Very little in the way of puzzles, no checkpoints in
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rooms - though they probably aren't needed anyway - and empty secret rooms. I didn't master it because I couldn't find anywhere that took me to Warp, 1N. That's not to say it's not there of course.
Sorry for being harsh, Sam. No doubt you are having fun making all these holds, but you ought to be thinking about whether the player will have fun as well.