If you never played this game before, well then you've missed out.
I know this has been posted in an old thread before, but now that there's an official Unicorn thread, I think now's a good enough time to bring it back.
It's now on the iPad/Phone and other mobile devices, but it got its start on the Adult Swim website. It's a basic enough game. Z jumps, X charges, you can double jump, get as far as you can. Simple, fun and surprisingly addictive, it's easy to get hooked.
https://games.adultswim.com/robot-unicorn-attack-twitchy-online-game.html