What would you change about this play?

[phuc]

this should be in the small stakes pot-limit & no-limit forum...

but anyway, depending on your game, I think your preflop raise should be slightly larger (if you are going to raise), but I don't know about $18-20. It depends on how much people are paying preflop at your casino.

Anyway, after the flop, the pot is probably around $30 (given your description) and when it gets to you, it's $35 because of the $5 bet. You raise small to $20. Your opponent has to call $15 to try to win a $50 pot with a double gutshot draw (any 8 or Q gives him a str8). Especially at a low stakes NL table, even if you push for $36, he is likely to call. Given that you started with only $60, I think this is inevitable unless you raised larger preflop or maybe he can fold the flop if you push (but he probably won't).