I enjoyed playing this, challenging but not to hard, i would have liked a few more power pickups i always seemed to run out of power.
I personally did not miss a front mirror at this stage it was usually fast enough to quickly switch move a bit and switch back so i was mostly in gunner mode. I could see if you extended this game and add more asteroids you would need something like a front mirror.
Only thing i miss is a web build. I think for jams unless its really impossible its best to provide a web build as you don't need to download, unzip wait for windows and virus scanner before you can play it.
This might also be a fun 2 player game where you randomly switch to gunner or driver position