2D game - tiny hiccups

I’m trying to make my very first game. Its a simple endless scroller 2D game build with Unity 4.3.4. and C#.

Everything works fine, but if you look closely, you can see it has tiny hiccups. When you look closely at the left, the particles not moving smooth at all.

What am i doing wrong? It looks like there is something wrong with the framerate or something.

Live version: http://www.atticweb.nl/peekgame/
Download: https://dl.dropboxusercontent.com/u/6929740/peekseek.rar

Could it be i’m giving him forward motion with changing the velocity? : rigidbody2D.velocity = new Vector2 ( speed, rigidbody2D.velocity.y )

You can try interpolate property of rigidbody2D to make it smooth. Select interpolate and you will observe the difference. I hope this would work for you…