not bad for a first sub.
i think there could be a bit more interactivity added to it. like if u made the cross hairtrail behind where the cursor would be... u know like slower then the mouse arrow. and maybe make it jiggle after the shots. and it could also use some sound FX for the shots too. next time u might wanna find a better song, i wasnt digging it. if you are gonna spend all that time working on a game try spending a bit more time on the BG. over all not a bad game keep working on it ull get better.