A well polished game with a combination of readable and clean UI. A deadly combo! However one thing I would like to add is the levels were a bit easy considering there were total 11 levels and all of them had very much similar solutions. You can play with (required moves to complete level) value. you can also play with grid squares on which certain blocks cannot be placed, you already have color going on, you can play with blocks that change color of the signal. These things would add a lot of variety for your puzzles in the game and also amp up the difficulty, where solutions are in front of you but you just have to see them. For a jam this is a great prototype and if you consider developing this further, my opinion would be to have a different variety of puzzles and you would have a great game.