++ for the concept of climbing electric sparks!
Worked perfectly on FF and Chrome (... cos I played it +2x xD)
I would prefer other keys as I have QWERTZ, but it was OK as you use X and Z totally separately.
15 lvls was a bit short. I'd love more, or maybe a level editor?
If you ever decide to add more levels, I probably would like to access a level select and have the possibility to skip 1-2 levels.
Apart the clumsily drawn figures (looks like they were drawn by someone who doesn't draw much), overall GJ! Loved it! :D