You get a 7, and here's why ( in my opinion )
So from one game designer to another I'm impressed with the concept. As I read the description I thought " Why the hell didn't I think of that?" As a concept, on paper, I can honestly say I holds promise. One button gameplay? I can see the challenges that presents, but if mastered, how great would that be as a player?
I think 1 button games and titles like "canibalt" come to mind, where the player is auto running and you time a button press to jump. I've read the lower rated reviews. Some seem like they were written by those who seem to be allergic to innovation, and carry an instant dislike to anything unfamiliar.
People like this will always burden trailblazers and hold us back as a society, like old people who are legitimately "afraid" of the internet, to fully accept a new idea, a generation kinda needs to die out.
I did however get a touch of the A.D.D and quit after the ( I wanna say ) 6th level due to some poor design choices ( If I jump when I release a button, but I must release or I'll die, only to be sent up into spikes-- a pattern must be fixed ).
I do give a 7 for having the balls to run with a concept I personally havn't seen before. That's the thing about something new, you don't know how the general populace will react until they try it. Unfortunately they can't all be winners, and if you have an idea that no one else has done before, sometimes ( not always ) there is a reason for it.
My 2 cents.