Amazing example of how beautiful minimalism can be. The background music was awesome and fit the vibe really well, the audio was simple but effective, and the character's eye movements were a really nice touch. I also found the controls in general felt really solid too.
I have to agree with others about the red and blue blocks, it was very difficult to determine when they were solid. I think instead of a fading opacity I would have just have them switch instantly between the two states, it would have made it a lot clearer.