Preflop
K6s from HJ is a little bit to loose, unless both CO and BTN are nits. Its not a big mistake to open the hand, but as a default this is just a fold.
Flop
Ok so you binked top and bottom pair against, what is likely two fishy opponents with a very wide range, since its 2NL. Half pot is missing value here, you need to go bigger.
Turn
A good rule to live by in the micros is this: "A raise on the turn is usually the nuts, a raise on the river is always the nuts". It refer to a situation like this, where you raised preflop and continued barreling postflop, and after just calling you, the Villain suddenly change his aggression level and raise.
Just think about it for a second. You raised preflop, barreled the flop, barreled the turn, and in case of the river raise barreled the river. You are representing a very good hand like at least top pair good kicker. So when someone choose to raise into that, they are saying, they can beat top pair good kicker. And in the micros they are usually not lying, because they dont expect, you are able to fold something that good.
Also look at his sizing! He is risking 4 times the pot, so you really dont need to defend here very often at all. Its different, if he made it like 60c. Then I probably hate life and pay him off to see, what happen on the river. And on this particular runout, the river card would have given you an easy decision, because it counterfeited your two pair.
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