Although personally if I heard about the endless runner (if it's the same game as the first one), I wouldn't bother downloading it... HOWEVER.. I think that's a great idea.
With minimal effort (hopefully), you can probably make more money that way since the appstore is just loaded with people who want free games. I think it'd be great to try and throw your game out there for people who don't want to spend initially. I'm sure some will fall in love with the charm and maybe even get the original version
So the sequel looks awesome. Is it bigger or basically the same amount of stuff as first just .. different stuff? Expecting it late this year maybe?