Also, no win/lose trigger after one team's fortress has been destroyed, but that doesn't really affect gameplay so it can be ignored for now.
Same here. It happened to me too and I was expecting something epic (like a big "OMG you're so brilliant, here are some fireworks for you!"), but no... How disappointing... :D
Anyway, I didn't see any bug as far I can tell, except with CPU which sometimes kill every unit in a base but don't wait for it to be under control before leaving... So basically they destroy every guy, and they continue their way to the next base. If the mech/hero is busy elsewhere trying to hold another base, nobody stands in the area to protect it and you'll most likely lose it when the next enemy wave comes.
I kind of enjoyed my first play on this map, though it's quite confusing at first (especially using the "deck" area where you need to gather your upgrades) but it turns out to be pretty simple to play. I lost many many times in the first 10-15 minutes though, I'm not sure if it's only because I took the Wraith but it seems a little weak when at first level... Forget it, I must be a total noob. xD