Shooting Part 1

Add this game-feel effect to my 2D game: Shooting — Recoil Kick.

Reference scene (context only — map it onto my own characters and sizes):
A side-view 2D scene at dusk. Pixel art: the hero (12×13 art pixels at 7px, about 84×91px) stands on the left facing right, holding a small pixel gun (12×6 art pixels at 4px) at his chest 42px above the ground; the muzzle is 60px in front of him. An orange slime (80×60px) faces him 292px to the right, with a 3-segment HP bar above it. The view is 438×190px with the ground 34px above the bottom. All sizes are screen pixels at that scale. Times are seconds, t = 0 is the trigger pull. The bullet (a 20×5px cream bar with a 14px gold tail) reaches the slime in 0.08s; the slime flashes white for 0.07s, squashes 12%, loses 1 HP and 5 cream bits pop off it. The 3rd hit defeats it (it turns white and 10 bits fly out 0.04–0.4s after the hit); a new slime drops in from 0.45s to 0.7s.

The effect:
On the shot move the hero and gun back 12px and tip the g …

The rest of this prompt — exact sizes, easing, colors and particle counts — and full prompts 2–6 are in the pack.