I did try it in Firefox and it was good. I liked how the plane was flying through the air.
A few suggestions: Have the score be on top of a graphic that would allow it to show up better. I did not notice the score value until I had about 400 points.
Have a press and hold for the space bar to grow it much faster instead of having to press it 1000 times to get the score faster.
I am not sure what angle is needed to decrease health, but it was very extreme.
Over all, top notch.