Sorry I know I didn't explain it quite clearly in my little tutorial. So basically you use 1 to put red in your potion 2 green 3 blue and you need to match the color to the color of the ennemy (exemple if the ennemy is red you press 1 two times to be able to damage it) if you use the wrong color it heals them. (How I calculate the damage is basically the difference between the potion's splash color and the ennemy's color)
Thank you for trying my game!