Great effort. I liked the art. The main character, enemies, and buildings were simple, but effective. Thanks for putting in the 'B to reset camera' feature as that helped the playability of the game a lot. Also kudos for getting a series of quests into the game in the constraints of a game jam. Well done!
You asked for how the game could be improved, so here's some of my thoughts on where improvements could be made. As you mentioned, there were some bugs, but I won't focus on them as the solution for most of them is just "fix this bug". :laughing:
First of all, the movement needs a little work. It doesn't at all feel like your driving a vehicle as there's no acceleration or deceleration. Movement is just either full speed, or not moving. Also, you're adding move speed for each direction pressed and not compensating when you have multiple inputs, so your movement speed when moving diagonally is faster than any individual direction.
Other people have mentioned the audio and I'd agree. The audio that is there isn't too bad, but it is very sparce. It needs more variety and some ambience to help make what's there blend together better.
Having the map was a good addition to let me know where I needed to go, but some indication on the map itself of where the next quest point is would really help. You did a good job of indicating where I needed to go in the quest descriptions so I never got that lost, but indicators on the map would add polish.
Additionally some feedback about when a quest is complete would help. In cases where you just need to get to a point (like delivering the explosives to the mine, or dropping off the stuff in the city) it was fine because once I hit the point I had to reach, I knew when the quest was over. But for fighting the boss at the oil farm, or the ambush south of the city, I didn't know when I had defeated the enemies and completed what I needed to complete. After the ambush south of the city, I went back to the base and the quest there just repeated the "It's a trap" dialogue when I tried to pick up the next quest. Not sure if that was a bug, or because I hadn't completed the previous quest.
Lastly, I'd highly recommend adding a way to quit the game. This is a pet peeve of mine, but I don't like it when there's no way to close the app and I have to alt+tab out of an game to quit it.
But overall I think this is a great effort, and you should be proud of what you accomplished in the jam! There's a lot of good stuff to build from, and I would totally enjoy playing a more polished version of this game, delivering destruction with a motorcycle with a flamethrower!!!