[Wintermute]

You played it fine preflop. KK is a big winner, and with low options, is very strong. On that flop, you might consider taking a more cautious line. You are very likely ahead EV wise, so if you can get all-in heads up, you'll come out well ahead in the long run. (Much of this equity is in the low draw, btw--A/2 will counterfeit many better lows). But leading at the pot is going to invite a lot of callers with so many draws live. Perhaps better options are to check-raise (if there is light action), or check-call and get more active on a favorable turn.

Still, getting all-in on that flop against several opponents is a good result, since your outs will never be shared (although some may be in other players' hands).