Remix: Crypt Raiders

Build a small, playable browser game inspired by "Crypt Raiders" (Action, Shooter).
Concept: Fight your way through a zombie-filled graveyard with loot, upgrades, and endless procedural levels.
Tone/hook (from the game's own page): Survive procedural crypts in Crypt Raiders, a free voxel zombie roguelite for the browser. Loot, upgrade, and clear floors solo or co-op.Survive procedural crypts in Crypt Raiders, a free zombie run and gun roguelite for the browser. Loot, upgrade, and clear floors solo or co-op.
Tech: use Three.js; keep it to a single page that loads instantly with no login or install.
Controls: keyboard and mouse on desktop, shown on a short how-to-play screen.
Players: single-player.
Core loop: include a visible score, a timer or round clock, levels, stages or waves that ramp up.
Audio: add simple sound effects and music (start audio on the first click/tap).
Steps: 1) get the core mechanic playable with placeholder shapes, 2) add win/lose conditions and restart, 3) polish feel, visuals and sound, 4) add your own twist (setting, character or one new rule).
Make it your own: don't copy the original's name, art, text or code.