Each level has a part time that is added to the total time afterwards, so when you go below par you end up with a higher starting time than before. If not, you lose some of your total. Since you start with 60 seconds, you got some extra time in your hands for mistakes, though (on purpose) on the hard maps that's less error time as the levels take longer to complete. Hence the subtitle "and I'm running out of time".
Do you think adding arrows to indicate the right direction would have helped you going through the course faster?