Yyyyeaaah we really lacked the time to implement feedback for the player's actions, actually you find pieces of keys with the clues, and they open doors. There should have been things like "a door has been open" or something to tell you you had made progress, but we just didn't have time. Glad you enjoyed it though :)
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No problem! I have similar issue in my game on the last level. I haven't had time to add notes and the last puzzle can be a bit to hard to solve because of that. You can check it out if you want. https://itch.io/jam/gmtk-2019/rate/461920