It's a platformer, so of course it's pretty fun. The game was easy to understand, and it didn't take too long to beat. And I also appreciate the Linux build.
My main gripe was the "blind jumps," or those hidden traps that you cannot see until you hit them. They felt annoying. Especially the falling stones in the last level that serve no purpose other than to slow you down. Speaking of which, I wasn't sure if I was supposed to see a black screen at the end?
Second, the delivery mechanic with the box seems unnecessary. The game requires you to go back to the checkpoint if you take any damage. Then why not just respawn/teleport me to the checkpoint? There's no point in keeping me alive if I need to go back anyways.
Lastly, I wish this game had a little more semblance to the theme. Aside from the box mechanic I talked about, and the truck sprite ,the entire game is no different from any other platformer. Granted, this game jam was super short and it would've been hard to add so much in the short timeframe. But I would rather have a shorter, simpler game that is unique and thematic.