SIEGE PROTOCOL

An inverted tower-defense game. You control the enemies — your tower kills them automatically. Every kill pays out more than it costs. Spend the profit on weapons, upgrades, and armor. Keep the tower alive as long as possible.

Play online: siege-protocol on Gitea

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How to Play

Open index.html in a browser, or serve locally:

python3 -m http.server 8080
# → http://localhost:8080

No build step. No dependencies.

Controls

Input	Action
1 – 0	Deploy enemy type 1–10
Mouse scroll	Adjust send quantity
Space	Open/close shop
I	Open/close inventory
Esc / P	Pause / unpause

The Loop

1. Deploy enemies using credits — each deployment costs credits
2. Your tower auto-tracks and kills them
3. Each kill pays a reward (always higher than the deploy cost)
4. Spend profit in the shop: more weapons, more weapon slots, tower armor/HP, shields
5. Survive until the tower dies or you go bankrupt (no credits, no enemies, can't afford anything)

Reserve: A minimum credit floor you set yourself. Keeps you from accidentally spending down to zero with no way back.

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Enemies

#	Name	Cost	Reward	Notes
1	GRUNT	20	30	Baseline. Weak to poison.
2	RUNNER	30	44	Very fast, low HP. Weak to lightning and poison.
3	BRUTE	80	112	High HP, 3 armor. Weak to void/fire/poison. Physical resistant.
4	SWARM	60	84	Spawns 6 tiny units at once. Weak to fire/lightning.
5	PHANTOM	100	138	30% dodge. Void-touched. Weak to fire.
6	ICELING	90	125	Ice elemental. Immune to ice, weak to fire/lightning.
7	SPARKLING	110	148	Lightning elemental. Immune to lightning, weak to ice/void.
8	VENOM	120	160	Poison immune. Weak to ice/arcane.
9	WRAITH	200	265	Ignores 80% of armor. Weak to arcane (2×).
10	TITAN	350	465	120 HP, 8 armor. Void weakness (2×). Extremely slow.

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Weapons

Weapon	Cost	Type	Notes
CANNON	free	Projectile	Starting weapon. Upgradeable piercing and crit.
FLAMETHROWER	800	Cone	Continuous fire cone. Applies burn DoT.
CHAIN LIGHTNING	1,200	Chain	Arcs between up to 3 enemies.
MORTAR	1,500	AoE	Lobbed shell, group-targeted. Slow reload.
POISON CLOUD	1,600	AoE	Lingering gas cloud with DoT.
FREEZE BOMB	1,800	AoE	Freezes enemies solid.
VOID CANNON	2,000	Projectile	Massive slow shot. Shreds armor.
LASER	2,000	Beam	Pierces all enemies in a line.
ARCANE TURRET	2,200	Projectile	Rapid bolts. Applies Amplify debuff (+25% damage taken).
MISSILE POD	2,400	Homing AoE	Fires at 3 targets simultaneously.

Up to 8 weapon slots can be unlocked via the shop. Each weapon has its own upgrade tree (damage, fire rate, special stats, element infusion).

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Elements

Seven elements with per-enemy resistances and weaknesses:

Element	Color
🔥 Fire	Damage over time, strong vs ice/void enemies
❄️ Ice	Freeze, strong vs lightning/poison
⚡ Lightning	Arc damage, strong vs fast/swarm enemies
☠️ Poison	DoT, weak to most elemental enemies
🌀 Void	Armor bypass, strong vs armored/phantom
✨ Arcane	Amplify debuff, strong vs void and poison
💢 Physical	Default element

Weapons start with a default element. Purchase Infuse slots in a weapon's upgrade tree to add up to 3 additional elements.

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Tower Upgrades

• Hull — max HP (5 tiers, up to +130 HP total)
• Plating — armor (5 tiers, up to +16 armor total)
• Servo Motors — aim speed (6 tiers, near-instant at max)
• Scanner — targeting range (4 tiers)
• Weapon Slots — unlock slots 2–8
• Field Repair — one-time HP restore (repeatable)
• Shields — choose Dome Shield (all-direction) or Directional Shield (rotates to track threats), each with their own upgrade tree

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Tech

• HTML5 Canvas, CSS, vanilla JS — no frameworks, no bundler
• 1600×900 logical resolution, CSS-scaled to fit any viewport
• High score persisted in localStorage (siegeprotocol_best)
• JS modules share globals; script load order in index.html is intentional

siege-protocol/
├── index.html          # entry point
├── css/
│   ├── main.css        # game UI
│   └── dev-console.css
└── js/
    ├── defs.js         # enemy/weapon/upgrade definitions
    ├── state.js        # game state and entity factories
    ├── main.js         # game loop, init, high score
    ├── enemies.js      # enemy AI and combat
    ├── weapons.js      # weapon firing logic
    ├── shop.js         # shop and upgrade system
    ├── renderer*.js    # canvas rendering (split by concern)
    └── ...

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License

MIT