This is a great concept and I would simply love seeing it developed into a full game!
In case you are still working on the development would it be possible to add an info that missions become completed only after beating the track? I didn't find any mention of it in the readme file.
Maybe it stems from my unfamiliarity with driving games but it really stumped me at first - even with 400k points gathered the mission still wasn't completed. At first I thought that it was a bug.
For some time I even assumed that each mission has to be completed within the two minutes time limit. I didn't thought that it would be at all possible for me to accomplish while gathering the meats.