There is a better build of this game attached on Canvas, I didn't update it here because I figured its possible you already started grading, and didn't want to change my submission. (The build on canvas fixes the bugged resource deposit placement system, which is necessary to access most of the content in the game.)
Edit: On second thought, I've realized I can attach it here as well under a new name. (guns_on_wheels_new.exe) Keep in mind other builds have not been updated.
Though not demonstrated in the video due to the aforementioned progression-halting bug - there are sound effects for collecting pieces of gold and powering off generators (solar panels don't power off, but the other two generators do, so you only hear the power on sound in the video.)