"Completely and utterly unfinished :)" - Hahaha, I feel you my friend. Happens to the best
Having a crosshair would help enourmousely and also consider changing the weapon to be hitscan instead of being bullet based. That way aiming would be more responsive.
The graphics do look bit silly and the hands cover halve the screen but it fits the game. Only the shader on the barrier that encapsulates the arena distorts everything a bit to strong to my liking