I was really impressed with the how ironed out the style of the game is for a jam, really well done there! I think the gameplay has potential to be fun, but in its current state I had a couple big issues that held it back for me.
I think the driving really needs some work as it just doesn't feel good to me right now. I would second Hekhound's comment about analog rotation - I think the 8-way makes the vehicle feel like its not very responsive to the crank, yet in 8th increments it actually turns on a dime no matter how fast you're moving.. it just feels very unnatural. You might even be able to get away with still drawing it as 8 ways but having the movement based on analog rotation, I think that might still feel intuitive enough to seem natural, though I could be wrong on that. You might also want to try limiting the actual turning speed so that your turning radius isn't always effectively zero. It also feels like the vehicle moves faster horizontally than vertically, though I think this might just be a consequence of the game's current isometric perspective and not really a huge problem on its own.
I also feel that the refueling mechanic doesn't really add anything to the game in its current state. It doesn't encourage the player to play any differently than they otherwise would - the craters already slow you down a lot and taking a long route is also going to slow you down a lot. It seems like an added slap in the face that slows the game down even more as a penalty for being too slow.
Sorry for ripping into your game! It's clear that you put a lot of care and effort into the game so I wanted to try to provide some constructive criticism as I think the game can be a lot more fun.