Okay, this is an interesting game. I didn't understand the game in the slightest at first, during the first two levels, but it clicks after a while. It turns out this is a memory game the whole time. I do like the idea quite a lot, and have had quite some fun till the end, but I currently have no idea how to expand and push the game further. The art is very cool and stylish, it reminds me of the time when everyone was doing cyberspace arts and themes, and it is very cool.
For some comments, I'd say the art is a bit busy, and it's quite distracting at times. Consider lowering the contrast a bit for the background and make the gameplay elements pop. I will also suggest adding a character of sorts, a light ball should do the trick, and make it travel between nodes when you are pressing them. It would make the "current" node pop out a lot.
Anyway enough said. I think this is quite a nice entry! Good job!