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https://github.com/imjasonh/nescript
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The previous platformer example drew enemies but had almost no interaction with them: only enemy 1 had a stomp check, the stomp window was unreachable under the default +1-px-per-frame-plus-a- jump-every-40-frames autopilot, contact from any other angle was a silent no-op, and the header comment promised a "title → playing → game-over state machine" that didn't actually exist. The README demo gif and the committed golden both froze that state — a level the player could walk through indefinitely with no consequence. Flesh the enemy interaction model out into something real: - `resolve_enemy_hit(e_sx)`: one helper, called symmetrically for both enemies. Computes the player/enemy hitbox overlap (horizontal in `e_sx ∈ (72, 96)`, vertical in `player_y ∈ (152, 176)`) and branches three ways — falling onto the head is a stomp bounce (`rise_count = 6`, `fall_vy = 0`, `stomp_count += 1`, `play Boing`); overlap while `rise_count > 0` is a grace pass-through so the stomp bounce itself can't retrigger contact on the same enemy; anything else (walking into the side, standing on the ground against the enemy) is fatal — `alive = 0` and `play hit`. - New `GameOver` state: draws four enemy tiles across the middle of the screen plus a coin row sized to `stomp_count`, stops the music, lingers 60 frames then auto-retries, and also honours Start for an instant retry. - Proximity-based autopilot: pre-jump when an enemy is exactly 19 px ahead (`e1_sx == 99` or `e2_sx == 99`), capped at two jumps per life by `auto_jumps < AUTOPILOT_JUMPS`. Tuning: a JUMP_RISE=12, GRAVITY_CAP=4 jump lands the player's feet at enemy-head height exactly 21 frames after lift-off, by which point the autopilot camera has scrolled the enemy under the player. The first jump fires on Playing frame 1 and stomps enemy 1 on frame 22; the second fires on Playing frame 101 and stomps enemy 2 on frame 122. After that the autopilot is exhausted and the third enemy encounter (camera wraps back past enemy 1) is fatal — the golden harness now sees the full stomp, stomp, die, retry, stomp loop instead of a frozen walk. - Live HUD: up to four coin sprites in the top-left, one per stomp, rendered both during `Playing` and on the `GameOver` screen so the score is visible in the death frame. `Playing`'s player draw is now guarded by `if alive == 1` so the hero disappears on the fatal-contact frame and the enemy that killed them is visible underneath. Verified with a per-frame ZP trace through the patched puppeteer + jsnes harness: first stomp at emu frame 44 (camera_x=22), second at emu frame 144 (camera_x=122), death at emu frame 283 (camera_x=5 after a 256-px wrap), `Playing` restart at emu frame 343, third stomp at emu frame 365. All 22 emulator goldens still match after the update, and `docs/platformer.gif` regenerated from the new ROM now shows two clean stomps, a clean side-collision death, the GameOver screen, and the retry cycle all inside the 6-second demo window. Golden updates: - `tests/emulator/goldens/platformer.png` — the frame-180 capture now shows the hero walking forward with a two-coin HUD after both autopilot stomps (previously: a frozen bouncing hero). - `tests/emulator/goldens/platformer.audio.hash` — the track now includes two `Boing` stomp bounces, which shifts the hash. - `examples/platformer.nes` — rebuilt from the rewritten source. Also updates the platformer rows in `README.md` and `examples/README.md` to match the new gameplay. https://claude.ai/code/session_013Bi4H4YQ5or5HtMB4doUFi
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