Thank you so much for playing and leaving feedback! Your points regarding sound and restarting were things we would have loved to do given more time. Also introducing the inputs better. Rotating blocks is needed for level 3 and Grandpa reminds you of the feature then, but if we had more time, we would have liked to add a short input section in the menu or a little tutorial.
One main problem we had with Godots physics engine was that the option to set RotationLimits in the PinJoint2Ds just did not work. This seems to be a known bug. Thus, all of our rigidbodies could rotate freely, leading to the cars practically deflating. We tried to add this behaviour by hand but ultimately decided to switch the engine as LiquidFun noted.
Also keep in mind that both our Engine Switch and using SmartShape2D led to us not being able to provide an HTML build. As some people only play web-based builds, these are super useful to get more feedback in a Jam. So you should think twice about switching engines if one of your main goals is to get a lot of plays. It did really help in our case, tho.