Web Serial API would also mean one could create an Atari-style paddle controller to go with this game, kind of like this project: https://github.com/drohen/paddle-game
If you're building something with a microcontroller, turn it into a USB HID gamepad device with an analog axis or digital (button) presses and then it should work with any browser right now: https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API...
