Hi
I bought and played this game on my other Steam account when it came out. This was featured on Scrapman's YouTube Channel and I was really looking forward to it. However this game has two fatal problems.

Problem 1
The player is a robot ball. Who can relate to being a ball? Hardly anyone it seems as Steamdb.info shows. As much as I tried I could not get myself to like playing as a robot in the shape of a ball.
The solution is simple. Change the player to an actual humanoid. To fit in creations you can have something like Scrap Mechanic where the people are midgets.

Problem 2
The audio is really bad. The vehicle sounds are whiny and unappealing. I found this very off-putting.
The solution is easy. Redo the sounds. Beef them up. Do the opposite of making everything sound pathetic and insignificant.

Problem 3
When I modelled stuff I found it frustrating moving the view to the right angle and selecting stuff. Not sure whether you have fixed this yet.