Thank you, i'm glad you enjoyed playing!
I agree with the difficulty curve, I changed it last minute as it was brutally difficult but it is a little on the easy side now, though you're at the mercy of the RNG somewhat. You can shoot the cars, they just take 3 shots, and they do area damage when they explode so you can take out groups of soldiers. I just didn't make this very clear as I ran out of time for a tutorial.
Destructible buildings/scenery were definitely on my trello board, but got relegated as the deadline drew nearer unfortunately, as did a high score board that tracked all your stats. You can still see them pop up in the terminal if you play the download version.
Thanks for the feedback!