I recommend a legend with each color is to click or not, can be a image on the description of the game. The way to change difficult is interesting.
It's in the main menu, maybe you missed it. Thank you for playing my game, be sure to rate it!
oh yes, I see that, my suggestion is a legend that we can see after starting the game, i said about description because we can see it any time of the gameplay while in itch.io
I will take a note for future development. Thank you for your suggestion, and once again thank you for playing.