I was a little confused at first about why I was shipping radioactive packages. (That's probably because I didn't read the instructions carefully)
Once I understood the instructions, though, I got the gameplay, and the core mechanic was actually really fun.
I do have a few thoughts about the instructions and balancing. Labels like Not Flammable and Not Fragile eventually became more of a comparison exercise than decision-making. I understand that's part of the experience of being a courier, but as the game progressed, I found myself just holding onto almost every package because meeting all the criteria became increasingly difficult. I'm not sure if that's intentional or simply due to the random generation.
One small thing that really got me was the timer. using 100 seconds instead of the usual 60-second format. I was mad.
Anyway, I really love the idea. It would be even better if the packages had more visual differences to help identify them at a glance, but considering this was made for a game jam, really enjoy playing it