The RUN levels are very tricky.
For the last level, remember to jump ahead of the platforms to not snag (slow down) on them.
After the 3rd jump, you need to create a platform to bounce as well as near the last wall.
The giant police car will not start after you on the second height level until you spray paint the yellow car. so you can practice your jumping pattern before the 2nd chase. To get past the close small blocks, you need to slow down just a hair in the run to easily jump them.
The last level is still very tricky to beat.