Very good job! I had a lot of fun with it.
It's a great execution of the theme. I really like that you use the countdown as a game mechanic, not just as a time limitation to achieve a goal.
The game looks good, and I would really love to see a bit more love put into the level backgrounds.
I liked that there were different timers with different uses. It was a bit hard for me to distinguish between them, though.
Overall, I had a great time, and it was an interesting experience!