Got 4792! Very fun entry!
I liked the screen shaking when you shot, but the sound of firing was too low so it felt lacking. I can understand you didn't make every gun firing very loud because the game would be just a mess of continuous shooting, but maybe the gun of the main character could have a bit more of juice by sound.
The shotgun guys fell like the most overpowered ally, if you have the luck of getting a lot earlier on it seems to make the game easier. Although after 3000 you're pretty set to die soon. The progression felt good enough though!