The graphics were really neat!
There is not a lot of games that actually changes the sprite state for when you are aiming up or down, and just that tiny addition makes the game feel so much more premium.
I don't know how you did the shooting, but somehow, even with no sound or feedback; Shooting the gun actually feels quite nice.
I hope that you manage to add the loading mechanic before the deadline, it'd be cool to see!
Edit:
Just tried the game again, and I just have to reiterate: The shooting feels good af.