I enjoyed the main quest and the three lantern hunt, but not even the path of observation let me escape the jarring gameplay switch, so I decided to call it a game with the standard ending.
Also the GUI navigation is a bit clunky. Not having a backscroll between clues, having to hit the inventory every time to light a candle rather than just having a hotkey for each item, or letting you shortcut by just X to interact once you have the useful item. And the clue to the green location should have probably been a collectable, so you wouldn’t have to memorize how it was done.
The cannon puzzle was excellent. I might have labelled each of the candles in the lighthouse puzzle with the symbol of their lighthouse to reduce backtracking later.