Truckful is a very colourful looking delivery mystery adventure from MythicOwl and Palworld publisher Pocketpair Publishing. A demo is coming next month!
In a Steam announcement the developer said it will be shown off at PAX West between August 28th - September 1st where visitors will be able to try it. At some point after, a public demo will arrive on Steam that will be "100% compatible with Steam Deck". They also confirmed they're "working on a native Linux version that will be available on full game release in 2026".
Every bit of footage I see on this just makes me want more. See some recent gameplay below:

Direct Link

Direct Link
More about it:
TRUCKFUL is a single player car delivery adventure game based around completing errands and quests for villagers and uncovering the ancient mystery that surrounds the nearby old forest.
Drive your pickup truck through winding countryside roads, dusty lowlands and small towns. Upgrade the truck, improve its weight and load capacity to make it go faster through all kinds of demanding routes. Pack the bed with fragile & shaky cargo of all shapes and kinds, whether its ice cold fish that needs to be delivered fast, or a classic grandma vase that will put your driving skills to the true test.
The seemingly welcoming countryside has its secrets. Hidden paths, misty wetlands, unforgiving marshes and dusty quicksands tell the stories of the past, waiting to be discovered. Explore a variety of landmarks and its surroundings and discover secrets hidden behind the forest branches.
- Drive, upgrade and customize your pickup truck.
- Pack the truck bed with cargo of all shapes and sizes.
- Complete errands for villagers in need.
- Enjoy a physics-based car handling gameplay.
- Unravel the mystery of the old forest.