what is heimdall fr?

Heimdall is a browser game that turns a real, live financial market into a retro style arcade experience. A small pixel viking runs across the screen, and his height represents the current price of a chosen asset, with a rainbow trail behind him showing recent price history. Everything else moving around him, resting orders, big trades, and liquidations, is also real market data pulled from Hyperliquid, a crypto trading platform, rather than anything invented for the game. No real money is used anywhere, the in game coins have no value, and the project is explicitly for fun and learning rather than actual trading or financial advice. You can pick from several assets, including tokenized versions of well known stocks like Tesla, Nvidia, and Apple, plus crypto pairs. There is a toggle between a live feed of real data and a built in simulator that needs no setup and works immediately. Ways to play include staking coins that a price level will be reached before it scrolls past, or making a quick bet on whether the price will move up or down, with the odds shaped by real order book imbalance. Big trades appear as whales flying across the sky, and real liquidations trigger a screen shake effect. Behind the scenes, a small server written in Node.js connects to Hyperliquid's data feeds over gRPC and rebroadcasts a simplified version of that data to the browser over a WebSocket connection. When no live credentials are configured, that same server generates a simulated market in the same format, so the game still runs without needing an account or API key. The visible game itself is built with Vite, React, TypeScript, and Zustand, drawn on a single small canvas that scales to fit any screen, with hand made pixel art and a synthesized soundtrack rather than any outside art or audio files. Getting real, live data requires a paid Quicknode account with access to Hyperliquid's gRPC streams, but the simulated mode works out of the box with just the two install and start commands for the server and the web app. The project is released under the MIT license.