Last game my opponents snake ran into me and I could tell that he was then done playing because his snake kept going in a straight line over and over. About a minute later it finally said I won.
Just a heads up.
Or .. were there still snacks popping up after he ran into you? If not, it's possible that the server restarted when that happened due to some exception so you just ended up playing solo with no server connection.
Fantastic game though, so addictive... the running score, and win ratio are great. It would be cool if you could see your opponent's win ratio or a rank of some sort too? Perhaps when you're counting down for the game to start?