Privacy
The short version: the game has no accounts, sets no tracking cookies, and keeps your settings in your own browser.
What is stored
Your display name, mouse sensitivity, field of view and volume are written to your browser's local storage. They never leave your device unless you submit a score.
Leaderboard submissions
If you submit a score, the nickname you typed, the score, the mode and the match length are sent and stored. Do not use your real name. There is no way to attach an email address or an account to a submission, because neither exists.
Cookies
This site and the game set no advertising or analytics cookies.
Removing your data
Clearing site data in your browser removes everything stored locally. For a leaderboard entry, write to the contact address with the nickname and approximate time.