The simple art style matches the game play. The visuals makes the player feel like they're doing complex stuff which adds more fun. It took me a while to understand how to play it, so, consider revising the instructions on how to play the game. To me the background music is on point with the visuals but the sound effects were a little bit mismatched from the art style. I suggest adding a little bit of animation in the background to make it more appealing and less static. You can also make it a bit more comfortable for the players by adding keyboard input as an option. Quick and easy game. This looks promising if you add more puzzle variations to make it unique. Smooth game, nice one!