Good work. Strange mechanic. Maybe a more visual way to distinguish between the hitbox and the shooter e.g. colour red/blue
The graphics especially for the bullets lacked depth and character e.g. Firey fireballs, spherical spheres, shiny bullets.
Shadows and glows from bullets, characters for more depth.
In addition, the players shots had no impact on the enemy shots but for me it felt as though the player has less power/effect/agency.