River is a raise/fold, depending on reads we have on villain (I would usually say table image as well, but not at 5nl). His bet looks like a blocking bet with a weak flush card/6. We are getting 8:1 on the river call so it is never a big mistake to call, however I think that this board is just too nasty even with those pot odds
to call, so ye I would either raise it to $2.00 or just fold.
Edit: just looked at villains stack and that villain is unknown, I would just fold river, not deep enough to have enough fold equity vs this fish.