Floating mech - Seems to be lag.
Releasing 2v2s and 3v3s was actually a mistake, it happened by accident. If you want I have a screenshot from a skype chat with Liran to confirm.
He's well aware of 2v2/3v3 replays not showing, I'm sure they're working on it. I was actually notified about that the day it was released.
As for the other bugs, they just seem to be minor coding errors. One mistyped character can be the difference between a red and blue laser beam being fired.