Great Execution! Really hooked me in. I liked the art, and I think you did a great job of introducing the mechanics in a way that I failed at first, but it wasn't too punishing. I really felt their was great balance on that in general, I never felt that "Ugh, I have to the whole thing again?" when I failed.
The combination of timing with the puzzle gives it just the edge it needs to be challenging too (and I admittedly failed to complete the last level).
One thing I would add is that the white text on the moving light-colored background was a little hard to read and either making the background static or putting a black outline on the text would go a long way for legibility.