Great submission! And this is really your first game jam - unbelievable ^^. Yes, as people have been saying in the comments, it's far from perfect, but for me it wasn't that confusing (though took a little time to understand what I have to do and why I even need to change colors). Nice balancing using cooldown times. Cute graphics. The screen is really small tho.
PS please rate my game, too - https://itch.io/jam/blackthornprod-game-jam-1/rate/319208