Adam Atomic's canabalt, and it was a brilliant and polished game (even if it was created in a super short period of time). I'm sad to see Flappy Bird mentioned

Adam Atomic's canabalt, and it was a brilliant and polished game (even if it was created in a super short period of time). I'm sad to see Flappy Bird mentioned alongside it, yet the comparison is apt and I've spent nearly as much time in a marathon happy bird session as I ever did in a canabalt session.