The line of fire is hard to see due to color of it being yellow I still don't know what colors to choose to make this effect stand out better. Also in case anyone noticed the bullet, on each shoot made by Player and AI, would vary on distance travelled for purpose of stimulating the possibility of hit or miss a target.
And in order to kill enemies YES you have to hit them in the main body part. This also frustrated me when designing this because I had to set the collision polygon of each unit such that the bullets land on the proper area of the unit bodies (they don't die if bullets hit their hat).
For Player recovery probably a timer would have been appropriate to indicate how long to wait until respawn along with death animations for visual feedback. The ability to shoot up and down relative to a fixed vertical position was something planned for machine guns only as to simulate machine gun accuracy. Melee sounds like an interesting idea. And when bumping into ally or enemy units there is no instance death unless a bullet was fired and it hit you in case there were confusions.
But never the less thank you for playing and providing game feedback.