It's looking awesome!
My one point about the visual style would be the lack of environment light/shadow on the hand-weapon and the lack of self-light/shadows on the hand weapon.
The environment is lit but the hand weapon doesn't change near or far from a light source. More to this is when the gun fires, shouldn't the hand-weapon receive lighting-shadowing colors and shifts for the gun blast light source?
Anyway, it looks great and I've no experience with 8-bit shooters so my points might just be out of place.
Hey man! You input actually is very useful, I completely forgotten to add lightning while shooting (will do that right now). The weapons themselves aren't going to have any shadows unfortunately, I really would like to stick with more or less minimalistic style, but maybe my attempts aren't that successful
Best regards!
Edit: youtube marked my game video as 'minecraft'... what a shame
Edit2:
Edit-(I do not mean that the environment doesn't flat shade the whole sprite, I mean that the sprite color set doesn't change shading to faux it's shape.) -end edit
I didn't get this one to be honest. Maybe you meant something like 'bumpmapping' to 'faux it's shape', or what?