it is a really good game. managed to complete all levels available. the bosses are a little bit of a difficulty spike. especially the water undine. This is a minor issue but using a colorblindness simulator you may have a problem with the colors used. the free simulator I used does the two most common forms of color blindness. (my mouse is normally a similar shade of red as the character it is the same color for both) you might need to darken the air slightly. here is a suggested range for Air if you decide to add a color blindness option. R range:0-176 B range:215-220 G range:220-231. this is out of 255. (the lower the number on the range the more of a perceivable difference). for fire and earth just adjust the brightness of the colors and it will work. both of these are minor issues and can be worked around. below are the alchemical hints with both color blindness shown as they are in game.
overall, it is really good. the use of deflection does keep the player on their toes and the use of black and white is definitely a good take on the theme. the game is very responsive, very little to no noticeable input lag.