Arcane Tycoon — Heroes & Magic theme park tycoon game

Complete browser game inspired by OpenRCT2 with fantasy twist:
- Custom roller coaster designer with physics-based ratings + on-ride POV
- 10 animated rides, 7 shops, 16 scenery items, path network & guest AI
- Heroes guild vs monster invasions (5 classes, XP/gear/bosses)
- Magic spell system (8 spells), research tree, economy/marketing/loans
- Day-night cycle, weather, park rating, awards, 4 scenarios
- Save/load slots + autosave, procedural WebAudio SFX/music
- Isometric canvas renderer, minimap, diagnostics overlay
- Test suites: smoke(13), linkcheck, inputcheck, framecheck, rendercheck, flow

js/game/economy.js

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+// ============ economy.js — money, finance cycles, marketing ============
+import { fmtMoney } from '../core/util.js';
+
+export function pay(state, amount, category, note) {
+  state.cash -= amount;
+  pushFin(state, category, -amount);
+  return true;
+}
+export function earn(state, amount, category, note) {
+  state.cash += amount;
+  pushFin(state, category, amount);
+  return true;
+}
+
+function pushFin(state, category, amount) {
+  const m = state.finance.current;
+  m[category] = (m[category] || 0) + amount;
+}
+
+export const FIN_CATEGORIES = [
+  ['rideTickets', 'Ride tickets'],
+  ['shopSales', 'Shop sales'],
+  ['entrance', 'Entrance fees'],
+  ['construction', 'Construction'],
+  ['wages', 'Staff wages'],
+  ['research', 'Research'],
+  ['marketing', 'Marketing'],
+  ['heroes', 'Heroes & gear'],
+  ['loot', 'Monster loot'],
+  ['runCosts', 'Ride running costs'],
+  ['misc', 'Misc'],
+  ['loans', 'Loans'],
+];
+
+/** Monthly finance close: wages, interest, archive */
+export function monthClose(state) {
+  // wages
+  let wages = 0;
+  for (const s of state.staff) wages += s.wage;
+  for (const r of state.rides) wages += Math.round(r.def.runCost);
+  pay(state, wages, 'wages');
+  // loan interest 1%/month
+  if (state.loan > 0) {
+    const interest = Math.ceil(state.loan * 0.01);
+    pay(state, interest, 'loans');
+  }
+  // archive current month
+  const cur = { ...state.finance.current };
+  state.finance.history.push(cur);
+  if (state.finance.history.length > 36) state.finance.history.shift();
+  state.finance.current = {};
+  state.lastMonthProfit = Object.entries(cur).reduce((a, [, v]) => a + v, 0);
+  return wages;
+}
+
+// ---------------- Marketing campaigns ----------------
+export const CAMPAIGNS = [
+  { id: 'flyers', name: 'Fairy Flyer Drop', cost: 400, weeks: 6, pull: 1.6 },
+  { id: 'heralds', name: 'Town Crier Heralds', cost: 900, weeks: 8, pull: 2.4 },
+  { id: 'crystal', name: 'Crystal Ball Vision', cost: 1800, weeks: 10, pull: 3.6 },
+];
+
+export function startCampaign(state, id) {
+  const c = CAMPAIGNS.find(c => c.id === id);
+  if (!c || state.cash < c.cost) return false;
+  pay(state, c.cost, 'marketing');
+  state.campaigns.push({ id: c.id, name: c.name, weeksLeft: c.weeks, pull: c.pull });
+  return true;
+}
+export function campaignPull(state) {
+  let p = 0;
+  for (const c of state.campaigns) p += c.pull;
+  return p;
+}
+export function tickCampaigns(state) {
+  for (let i = state.campaigns.length - 1; i >= 0; i--) {
+    state.campaigns[i].weeksLeft--;
+    if (state.campaigns[i].weeksLeft <= 0) state.campaigns.splice(i, 1);
+  }
+}
+
+// ---------------- Loan ----------------
+export function takeLoan(state, amount) {
+  amount = Math.min(amount, state.loanLimit - state.loan);
+  if (amount <= 0) return false;
+  state.loan += amount;
+  earn(state, amount, 'loans');
+  return true;
+}
+export function repayLoan(state, amount) {
+  amount = Math.min(amount, state.loan, state.cash);
+  if (amount <= 0) return false;
+  state.loan -= amount;
+  pay(state, amount, 'loans');
+  return true;
+}