turn bet was for value. River bet a bluff or value? I almost timed out thinking about it. I had originally planned to fold if heart hit river but the bet sizing looked bluffy. Villian's turn check seemed to put me ahead. If he hits flush does he < 1/2 pot bet river?

16/13/3 over 200
3% 3bet
67% cbet

$0.10/$0.25 No Limit Holdem
9 Players
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16/13/3 over 200
3% 3bet
67% cbet

Stacks:
UTG ($11.34)
UTG+1 ($40.99)
MP1 ($26.05)
MP2 ($19.75)
MP3 ($23.80)
Hero ($25)
BTN ($77.15)
SB ($17)
BB ($11.56)
Pre-Flop: ($0.35, 9 players) Hero is CO
1 fold, UTG+1 raises to $1, 3 folds, Hero calls $1, 3 folds
Flop: ($2.35, 2 players)
UTG+1 bets $1.50, Hero calls $1.50
Turn: ($5.35, 2 players)
UTG+1 checks, Hero bets $2.80, UTG+1 calls $2.80
River: ($10.95, 2 players)
UTG+1 bets $4.50, $4.5 to Hero ($19.7)?