Amazing game! Have followed it's development closely before it went "online", and have to say: it's been a great journey!
Here's a VOD on Twitch from a few days back! No commentary, just raw gameplay!
Have you been plugging your controller in and out for two minutes at the beginning?
Tried some of those retro controllers that were laying around the office, but the cables were messed up, so they only would work in certain orientations. That's why the unplugging happens at the first 2 minutes. Eventually we picked up a single Xbox controller and used the spacebar for the second player