great job on this. Really well polished gameplay. Nice visuals. quick to understand, with a difficulty to master the gaps etc. Excellent puzzler.
Future wise, I'd be suggesting. levels based,.. get these 3 specific packages to the drop zone in the timer,.. and ramp up the difficulty in the puzzle layout (arena) as well as the number of packages etc.
Then you're into extra's and pick ups and consuables etc.
But that's all future stuff, not game jam scale. I hope you do continue this project, well done team.