Don't read this if you haven't played yet!
I liked the meta puzzles in this game! I feel like the game needs some . This might be a hot take, but the last elusive down as listed in the doc was actually my favorite one. You should put some kind of prompting hint for it after players get all the other ones, but I found the "outside-the-box" nature of that one pretty funny.
#2 is great because it sets the tone of the game, things not being what they seem, and then you'd look at all the other ones you missed. I think #3 could be replace #1 as the intro puzzle, because it feels more self explanatory. With Puzzle 1, I couldn't enter it even with the solution in the doc. Maybe there's a better way to position this puzzle? I feel like 3 free-entry text boxes might be too open ended to give to a player as a puzzle without connected hints (it's done way better in #3). Maybe you could do letters you can drag in, or point out things from pictures/a map.