I am playing similar stakes than you and don't want to pretend to be any kind of an expert. My thoughts about the hand might also be biased by the peek to the results, but anyway...
I don't really understand any of your plays you took postflop. On the flop, you lead weakly with just one over when the initiator is still left to act. In my opinion, this could be a somewhat decent attempt to take cheaply the pot down, but I am not sure whether it really is. You'll get calls from any 66+ and any king (his range on UTG is probably just KQ, KK and AK, maybe KJ) and of course any spade draw, although you are blocking the nut flush.
If the bet on the flop might have been OK, I don't find any reason to bet the turn. To get value from flush draws? A deuce does not scare away any of his hands he would have been calling the flop with. After he raises, I would be inclined to put him on a flush draw or a full house (...or maybe not, there are not that many combos, just KK and he could slowplay it), but would still find calling VERY DIFFICULT (this might be just my lack of experience). Would he open 65s from UTG? I don't know. Would he raise the turn with KQ, AK or AA, don't know that either.
Now when I start to think of it, the check/call on the river might have been OK, because there are very few sixes and deuces on his range, probably just 66 and maybe 65s. Also, I don't think he would bet pocket pairs, at least anything else than AA. It's a gutsy call, but I would not have balls to do it.
I would probably have check/folded the flop. That having been said, some players' cbet range on this kind of boards is usually weighted towards bluffs, so it might be also a call or even a bluff raise, but being out of position and continuing with anything else than an A on the turn would be quite difficult.
I would be interest in to hear comments of more experienced players.
BR,
ruastinraata
EDIT: OK, there were some comments that have been submitted when I was writing this message.