Thank you for testing my game. Indeed, the choice of a single mouse button (click or hold) to control all the buttons of the game is not obvious: but this is the main restriction of the gamejams for which this game has was originally imagined. When I had to make the graphics, I discovered this PJ2 gamejam for which this project could also be suitable.
I therefore cumulated all the themes and all the restrictions in the same project (something I do frequently, to have a more original creative thread). Unfortunately, if I've followed the principles of the Palette Jam 2, I did not imagine for a second that the gameplay could be a problem, since it was obvious to me that only one button was needed, forgetting that the PJ2 players would not have this restriction in mind while playing ...
So, sorry for the gaming experience which you did not like due to this restrictive gameplay. I still think the result isn't bad in and of itself, but maybe I should have only reserved this project for one-button jams, and not be part of PJ2. At least, with this jam, I still learned to use a palette, to use precisely the numbers of the color and its RGB details, something that I did not know/use before.
If too many players complain about my gameplay, I will withdraw my game from submissions for this jam: my goal is not to create something harmful to the fun. Again, thank you for your comment and for playing my project. And well done for yours which already seems to win all hearts ^ _ ^