Completely. There is nothing inside it to buy, and no paid version with more content.
No, and this is not a technicality. There is no way to put money in and no way to take money out — nothing in the game turns into money or goods. Your score sits in your own browser.
Because we collect email addresses for the downloadable builds and we would rather not hold addresses belonging to children. The game itself has nothing age-restricted in it.
You leave an address and pick Windows or Android. One of us sends the link by hand, usually the same evening, Melbourne time. You get one email. We do not run a mailing list.
The browser version caches after the first load, so a lost connection mid-round will not kill the game. The packaged builds are fully offline.
Not yet. Neither of us has a Mac we can build on, and renting one for a free game is hard to justify. It is on the list.
Tell us on the contact page. Include your browser — the star hit-boxes behave differently on older Safari.