The gameplay worked well for me. Took me a moment to get use to the mouse slingshot, but once I did it was a fun mechanic.
The retro style was an interesting choice. (I think I saw there was a Nokia jam, so I'm assuming this was for that as well?) I'd like to see the timer changed a bit though. In certain places, I could see it all that well. Maybe a solid dark box behind it? Or maybe a slight top part outside the general play area?
Overall, a nice entry. I recognize that you did this to work in all three jams. Great job!