I loved the pixel art. Very good work there. Puzzles were a bit hard. I discovered the lights and the interaction and most of the sequence without the book. There wasn't really any indication that the lights would open the door so I thought I had found cute little interaction with the environment rather than a puzzle. I was completely lost in the potion room. I have an understanding of the puzzle elements from the book now but no idea what I need to interact with in order to solve the puzzle. More feedback for the player when they are clicking about and some more direction as to what I'm supposed to do in the puzzles would go a long way.
Nice job over all!