KK hand from 6-max, how did I do?

[ludo72]

Villain is 32.4/2.94/0.88 after only 34 hands. Hasn't done anything unusual since I sat down.

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

Button ($34.70)
Hero ($35)
BB ($75.45)
UTG ($34.80)
MP ($11.50)

Preflop: Hero is SB with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
UTG calls $0.25, <font color="#666666">1 fold</font>, <font color="#CC3333">Button raises to $0.5</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">1 fold</font>, UTG folds, Button calls $1.50.

Flop: ($4.50) Q[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3</font>, Button calls $3.

Turn: ($10.50) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $5</font>, <font color="#CC3333">Button raises to $10</font>, Hero calls $5.

River: ($30.50) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $19.7 (All-In)</font>, Hero folds.

Final Pot: $50.20

I don't feel good about the way the hand played out but I can't figure out how should I have played it instead. Any suggestions?