Out now with Linux support is Death of the Reprobate, a comedy point and click adventure game styled like renaissance artwork from Joe Richardson.
This is the third and final instalment of the Immortal John Triptych, spiritual successor to Four Last Things and The Procession to Calvary. You don't need to have played previous games though, it's thoroughly funny and weird to play through entirely by itself. If you love classic British comedy like Monty Python, you're going to love this.