This is an Advergame we made for Almacenes Exito a big retail stores company based in Colombia, South America.
You can play the game on their website:
http://www.exploradorexito.com/public/game/corre_martin_corre_game.html
More info and projects on our site
www.c2estudio.com
Thats a fun little game. The only issue I had is that I think the player starts too close to the rock, or at least a countdown should happen before the game starts. I think you need to give a little time for the player to get ready to play if you have then from clicking a button to pressing the arrow keys.
Si, lo mismo me ocurrió; inicié la partida yendo hacia el lado de la roca.
Me gustó mucho la animación del personaje principal 
this really is a nice game, enjoyed playing it. are you generating the level randomly? that’s pretty cool, i didn’t even notice it at the beginning, because it was fitting together very good, good job there.
i agree that you should give the player a little bit more time at the beginning, sometimes you die before you find the right arrow key 
i couldn’t play it very much, because i’m at work, but there is no ending of the level, is there? maybe that would be a nice feature, but maybe i just didn’t get far enough. those traps where you fall through the ground are very hard to spot in the beginning if you don’t know about them, maybe you could make it a little bit clearer that they actually are traps and not just a couple of rocks on the ground.
Hey Guys! Thanks for the comments. You are right, it is a little fast when it starts. A countdown would be nice!