A group of players live streamed their session of Beam Saber which you can find here: https://www.twitch.tv/videos/222862611
The video is 8 hours long and starts with character and squad generation, which ends at about 3h16m, and the game play starts at about 3h34m.
If you just want to read what happens I live tweeted the game while it was happening! https://twitter.com/Notaninn/status/957264827931615233
If you want to see Beam Saber for yourself you can find it here: https://docs.google.com/document/d/14uhsdQIyMEoKEx0jGcE9eXIEm0R3MYv6uRCafKINa2k/edit?usp=sharing