Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with the timer around 100, others might run out of time on their first try.
Here is a level that I was originally making for the 2011 Vanilla Contest but scrapped due to new rules about the music. The SMW music would not have fit. I however decided to finish it and release for C3.