Also 32 scientists is just too long. I got bored and stopped playing half-way through.
I reduced it to 8 scientists.
would it be possible to slide along the walls you run into instead of stopping dead?
Done.
The near plane is too far, so I kept finding myself stuck against walls I couldn't see until I reversed, and there seem to be z-order issues which cause zombies and scientists to appear to walk through walls.
Unfortunately, I can fix this due to the size constraint.
Please switch the colors of the zombies and the scientists.
I tried that, but red zombies get camouflaged against your bloody windshield.
Is there anything very special at the end of the game to motivate us to try again ?
Nothing really to write home about.

But, the latest round of changes should make playing the game easier. Give it another shot if you're up to it.