I tried fifty times, I am not your average "casual" gamer. Nope, I did make it to the other side in the tutorial stage. Badly designed controls, or counter-intuitive controls, ... I mean you have taken your time to DESIGN a tutorial stage. Instead of telling how to use WASD, you might want to explain to me, how to use the portal gun correctly.
So you failed at the design of the gameplay itself. And that forces me to give you less than 2 stars.