The intro story, and feel of the game feels wonderful.
I personally wish a progress bar was added. Maybe to show the next safe house, stop along route 66 , or ending of the game.
but besides that it was fun.
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No worries!
Just a progress bar to show the next destination if there is one.
Conversely with your goal of no ui. There could be a sensor on the truck that detects a "safe zone" to rearrange some elements on the truck without the zombies coming.
It was really great overally, I really like the lore as well.