I wasn't sure whether to post this in 'gaming' or in 'bitcoin'. To be honest I wasn't even sure whether to post it at all as I have no idea what the reaction might be! Anyway, here it is...
It's basically just a bit of a twist on the classic Asteroids, with something of a Bitcoin theme. It takes a few levels of play for the 'twists' to become apparent but don't expect too much π.
It's playable in the browser, but it's not designed for mobile (requires keys to play).
Play it here - https://hashteroids.btcdir.org