It's boring as hell, just like Flappy Bird. I can't score this on my overall opinion, because then it would be a 0, because I find the "helicopter" genre of games just boring.
So instead, I'll score it on my initial impressions of the technical quality of the game. It's well-built for what it is...that's really all I can say. I mean, it's just a screen and some obstacles moving left. With an object that falls down and has its gravity vector negated when you click the mouse. It's kinda hard to screw up. Just like it's kinda hard to screw up a snake game.
2.5/5 feels about right.