Is donk leading river not good here? at the time, my thinking was i dont want him xbacking worse aces when the heart comes. but now looking back, when he bets turn, he probably has a flush draw or 2pair/sets. Any thoughts? Should i just xcall river, depending on sizing?

PokerStars - $0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 127.8 BB (VPIP: 12.96, PFR: 5.56, 3Bet Preflop: 0.00, Hands: 54)
Hero (SB): 103.6 BB
BB: 137.4 BB (VPIP: 50.00, PFR: 50.00, 3Bet Preflop: 0.00, Hands: 6)
UTG: 122.6 BB (VPIP: 25.00, PFR: 25.00, 3Bet Preflop: 16.67, Hands: 13)
MP: 112.4 BB (VPIP: 31.25, PFR: 18.75, 3Bet Preflop: 0.00, Hands: 17)
CO: 148.4 BB (VPIP: 20.00, PFR: 13.33, 3Bet Preflop: 0.00, Hands: 30)

Hero posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 4 A

fold, fold, fold, fold, Hero raises to 3 BB, BB calls 2 BB

Flop: (6 BB, 2 players) A 4 3
Hero bets 3.8 BB, BB raises to 11 BB, Hero calls 7.2 BB

Turn: (28 BB, 2 players) 5
Hero checks, BB bets 18 BB, Hero calls 18 BB

River: (64 BB, 2 players) T
Hero bets 29.2 BB, BB raises to 105.4 BB and is all-in, hero?

I don't like the lead i lean heavily towards check fold river. Anything you beat now checks back the river.

Re raise flop imo
Agree with check fold river as played.

Always 3betting flop for value vs a random at 2NL. C/folding river to a big bet as played seems reasonable - there is literally nothing you beat that he would bet except a stone bluff or a pair that he turns into a bluff (which 1 in a 1,000 does at 2NL).

Don't donk river