Love it. You have a perfectly minimalist game, but you didn't forget to include basic functions, such as a mute button and a level select. Not too tough, but enough to make you think. It certainly tests your ability to be patient when you need to be patient and move quickly at a moment's notice. I did think it was weird that you included a checkpoint system earlier on in the game when it was largely unnecessary, but removed it when it would have been a great boon.
The look of this game reminds me of old Atari 2600 games, or early-era computer games, where everything was so dark and sketchy, with changing colors and strange shapes moving in bizarre patterns, that the experience could be surreal and creepy. In spite of the minimalist approach, I found the game interesting to look at.