I really liked the puzzles in this game. However, there were some issues i just can not ignore. For example the lack of an option for going back - I had no way of looking at the drawings (which were very good) again or to look at clues in the chamber before. Also I had to repeat a puzzle when I accidentally clicked on it.
Also, I was able to solve some puzzles by accident with random clicking, I played it again to see how they work and was interested in your numerals, which I did not actually realize wer number orientated.