Easily one of the most polished game in the entire game, and most impressive you made it by yourself! the core concept is simple : move the orange block to the green one, and you've managed expand on that basic mechanic to its fullest potential.
I also really like the general aesthetic of the game, everything is clear, easy to identify but also has just the right amount of grain and noise to give the game a unique look.
The fuzziness of the music and sound effect also helps to create a unique feeling to the game, it's comforting but also somewhat unnerving so you're never really at ease.
I could see this being expanded into a full game, wonderful job!