Well done on making this multiplayer game! Reminds me a bit of "Keep Talking and Nobody Explodes" which is always fun. I opened the game into two tabs so I could give it a test. I admire the creativity, took a while for me to notice all the elements - the sun/moon, the rats with the different symbols, the ghosts that appear, and also the place you can draw at the bottom, very creative. I think generally I am able to finish the cauldron levels, although even with just me I do have to look quite closely to match up the symbols since they are quite similar. 

The candle levels I have only managed to complete a couple of times, and I can't figure out if it is because I am doing something wrong. I did notice (after a number of failures) that it said the candles on the left and right hand side switch also, and that helped me succeed twice with the candles, but then I seem to still fail and I'm not exactly sure why yet. I think part of what might help is if I could see the result instead of going directly to the failure message. If I press the wrong candle, they could all switch, including the ones to the left and right, and maybe being able to see it would help me figure out what I have missed.

Anyway, cool idea, I imagine could be a fun multiplayer game!