The last puzzle in this is right up there with t=20. WHERE is the clue other than make a pretty picture with the moon and stars?
Other than that, this part feels like you ran out of ideas and dropped the mysterious person who left the players there and you just dropped us on a beach, because sand.
With all three played through, I can tell you need these things: 1. Full planning for all games at once, with a balance of puzzles throughout, 2. an over-arching plot, carried through to the very end, 3. better player guidance through object acquisition, and 4. a beta reader to catch your grammatical errors before they get in front of a larger audience.