Here are my thoughts on each street:
PF I prefer a fold because KQo will play so badly postflop, as the situation shows. But maybe there is room to 4bet some percentage with KQo.
Flop I like your bet as played.
Turn I would bet. You might be dead against AQss or ATss on occasion but I think you can get value from some QQ/TT/KT type hands and you still have equity against KJ, QT, and sets.
River I am a little hesitant, and curious what an equity calculator has to say. You're up in your range for this situation but I do not think many players would bluff their medium strength hands like QQ, TT, AJ with an ace of spades. I would guess at this point he will have a hand like KJ, QT, flush, 99, JJ, maybe even AA at too high a frequency for you to call.

seems ugly, because your 4bet isn't big, he can flat pre wide thus on the river put many hands into a bluff (JT,TT,T9) along with big value range 2 pairs+++.
so we are looking at our bluffcather -> good one blocking Ks, and looking pool - > 3bet too little SB/CO and not aware of odds/scared to call 4bets and bluff big pots ( that sounds too harsh,and I haven't played party poker, if that's not true calling river seems like an appealing option)