Algodoo

This car has decent suspension, good deformation and the visuals are great overall. There are a couple problems i would like to point out.
The axles on the wheels disrupt the visuals of the wheels. I would recommend making it transparent and move it to the "back" (select the axle, hold shift and scroll).
I wouldn't use the colors on the top left corner. Instead, use the color picker or the HSVA sliders.
The door should be the same color as the body of the car. To add the outline, use the brush tool, draw the outline in a small size (say at least 0.010) and make the color of the outline black.

I almost forgot to point out that the suspenion is a little wonky. To counteract this, make the spring's strength stronger (between 700 - 1500, depending on how accurate it is to the reference image) and to avoid excess bounciness.

7/10