Ok I went head on at first and didn't understood the assignement. After reading others comments I took another go and omg it was a blast! really cool idea! well implemented! I haven't finished the level but I loved playing and trying to wrap my head around the time mechanic! The indications like the warning sign is a great way to guide people along the first part of the level and the difficulty level scales smoothly across the game. Love it!
The only thing I could say is the tutorial part. Maybe smaller text, with less contrast on the screen and more room around to breath would have made it easier to read. Game wise, nothing to say, you made it perfectly =D