Game seemed to work fine on my system. Chatting worked, moving and jumping worked. If this is actually connecting to another server and not running some localhost thing this is pretty cool and I'd love to try it out with people other than myself, seems like it would be fun.
Found a bug where other characters won't despawn when you disconnect and they instead just fall.
Pressing revert&return in the appearance menu only reverts the color of your character, things like your name, sfx choice stay the same. Not sure if being able to wall jump upto 3 times is intended or not since your jump distance is so limited but its there and its cool.