Hi. Thanks for playing our game and your great feedback. We really enjoyed making it and love to see others enjoy playing it.
I will post the location of the hidden puzzles below. If you wanted the solutions to the puzzles instead, I can DM those to you.
I can't see a way to hide spoiler text, so will just add a note:
SPOILER: the following text has spoilers on a secret hidden puzzle
The secret puzzle found in the shrine in the village needs 4 other puzzles to be solved before it can be solved.
The 4 hidden puzzles display the initials of the 3 people that worked on the game, (CJ, JM and RB), and then the white puzzle is like any other puzzle with no specific message. These are hidden all over the map. Once one of them, is activated you can follow the laser to where the final secret puzzle is located.
Red is hidden by the house that is under construction in the village
Green is hidden by that hay near the windmills
Blue is hidden under some rubble (fallen floor) on the ground floor
White is behind some trees on a hill, behind the tower that shoots the green laser towards the center tower
Once you have solved all those puzzles you will have the necessary lasers to solve the final hidden puzzle.
Unfortunately there is no reward for solving the final puzzle other than the satisfaction of doing it. But great job in finding it.