I structured the prototype around a simple progression model: learn the controls, survive pressure, spend abilities wisely, defeat a boss, and finish with a clear final action. Every feature had to support that loop.

The HUD was treated like a compact cockpit. Health and energy stay together on the left. Shield and Atomic Roar live together on the right. Score, high score, wave state, and boss messaging sit in the center. This keeps the player’s scan path predictable even as the action ramps up.

A big part of the polish was keeping the language short and cinematic. Instead of long instructions, the game uses direct arcade prompts like Incoming Jets, Bomber Alert, Sink The Destroyer, and Tokyo’s Defenseless // Move Right To Attack.

Start: The player selects Godzilla or Mechagodzilla. Both share the same core rules, which keeps the prototype balanced, while their color, audio, attack effects, and sprite treatments create two distinct identities.

Defensive Wave 1 · 6 jets: Establishes movement, beam attack, shield behavior, guided missile readability, and basic survival pressure.

Defensive Wave 2 · 8 jets: Introduces more pressure and bomber events. The game starts asking the player to manage screen space, not just aim.

Defensive Wave 3 · 10 jets: The final perimeter before the boss. Enemy pressure, missile timing, shield use, and submerging all matter more.

Boss Fight · 0/1: The destroyer enters the waterline with a blue health bar, guided missile fire, and a staged defeat animation. Once sunk, the player gets the final prompt: Tokyo’s Defenseless // Move Right To Attack.

Player systems: The kaijū starts with 150 HP, 100 energy, and 3 automatic shield charges. The primary attack is an atomic beam. Horizontal movement adds a subtle bob to make the character feel heavier. Submerging hides the kaijū beneath the waterline, but recovery is slower and staying down too long triggers Depth Pressure.

Special abilities: Atomic Shield automatically blocks incoming damage while charges remain. Atomic Roar is a once-per-run emergency clear that drains energy and shield, removes visible threats, damages jets, clips bombers, and leaves the destroyer boss immune so the boss fight still has to be earned.

Enemy systems: Jets are the core wave enemies and can fire up to 2 guided missiles. Bombers appear as special events, use two variants, and drop 6 to 8 bombs in a carpet bombing pass. Only one bomber can appear on screen at a time, with a maximum of two bomber events per run.

Boss system: The destroyer appears after Defensive Wave 3. It uses guided missiles with intentionally imperfect tracking, a blue boss health bar, and a multi-stage sinking animation with splash, bubbles, burn effects, and screen shake.

Scoring: The game rewards enemy destruction, survival, city damage control, time bonus, boss completion, and final score. Shared high scores are supported through a small PHP endpoint and JSON score file, with local storage used as a fallback.

Trivia mode: A new Godzilla-universe trivia layer adds randomized questions, randomized answers, a 15-second question timer, correct/wrong feedback, answer reveal, and an arcade score cap designed to stay readable at a glance. The start button consistently uses Ready Player One, keeping the entry point playful and clear.

The HUD groups information by what the player needs to understand quickly. Survival data lives on the left, special abilities live on the right, and progression lives in the center. The center status dynamically shifts from Defensive Wave 1 0/6 to Defensive Wave 2 0/8, Defensive Wave 3 0/10, and finally Boss Fight 0/1.

Feedback is layered on purpose: red damage tint, shield flashes, explosion particles, water splashes, guided missile glow, boss health, score changes, trivia answer states, and short status copy. The latest HUD pass also tightened the bottom control layout, added stronger inner glows to the Godzilla and Mechagodzilla buttons, refined kaijū health bar glow, and made the cyan destroyer health bar more visible during the boss fight. The goal was to make the player understand what happened in less than a second.