Question! How did you get so high on this game?! Is there anything I can pick to have more time? It feels like one of those designs that is "easy to get, hard to master". I liked the music-time mechanic, as it allowed me to get beyond the initial spikes; but, after that, time was over.
The pixel art makes is very clean for a pixel perfect experience (even if the pixels from the art are in fact several pixels at the viewport). Then you get a smooth experience with a retro style, without losing accuracy due to the lack of in-between pixels during movement.
Verticality goes with the game mechanic and allows you to export to mobile platforms. Right choice, as having made it horizontal would feel like a double miss!