The latest release is supported. Older versions are not.

This is a single-player game that reads no network input and writes no files outside a path you pass it, so the attack surface is small. If you do find something, please report it privately rather than opening a public issue:

• Use GitHub's private vulnerability reporting, or
• Email jon@jonwilliams.org.uk

Please include what you did, what happened, and what you expected. You can expect an acknowledgement within a week.