Thank you for playing, and thanks for the feedback!
The speed control was something I wanted to add originally, but it caused some slight difference in the way the vehicles moved. At the time the source of the issue wasn't immediately obvious, so I decided to remove the feature instead to keep the consistency. From the feedback, I think it would have been better to keep it instead since the issues it introduced were only in a couple specific cases and the chances are people wouldn't have encountered them anway.
Thanks for the suggestion too, a high score (or low score?) for number of instructions for each level would've been good!