$5 NL 6-Max, Another AA hand against somewhat unknown villain

[Frosteater]

Seriously, raise the flop. It's a good flop for you and I hope you'd be raising here if you had tens. In that case I think you should raise with aces as well, at least on the turn. You've been the preflop aggressor, the last thing you want is to have your initiative taken away by weak bets like this. What if you had AK here? If you don't raise with hands that are very likely to be good, you won't be able to take the pot down when you miss. You're going to maneuver yourself into a spot where everyone may call your preflop raise and donk into you, because you have to fold. I'd be willing to get this all-in ASAP, since I don't see villain folding A8 or 99+ here. He might have a set, good for him, but in this situation at this limit any overpair is usually willing get his chips in the middle, as well. So think about how you can get your stack in here and reload if he has a set. The other option would be to completely freeze when facing a bet as small as half the size of the pot, because your opponent might have hit his 2-outer.

On another note, and I'm asking because I'm really interested, what exactly is meant by "evaluate on the river"?
I don't quite understand what there is to evaluate as I don't see how the river changes your situation, no matter which card comes.
If an ace comes, you are beating the sets but probably won't get much value of the overpairs, you were beating.
If any diamond, nine or five comes, you're probably folding to a bet. And set yourself on tilt, if it's a $0.55 bet again.
If a ten, jack, queen or king comes, your still behind the sets, won't get any value out of missed draws and one of the possible overpairs is ahead of you now.
Threes and fours are probably safe. But still, you're beating overpairs and loosing to trips - just like on the flop.
So, how exactly does evaluating on the river look like and why is it any better than just raising the flop and stacking overpairs?