I like your line and agree it's most likely 44/99. I'd also bet again because their turn raise is hardly a raise and they could just be clicking buttons with any random hand.

Folding to the jam as a 12/5 doesn't shove a flush draw here.

I doubt an NL4 opponent especially one playing 12/5 will have high enough table awareness to pay attention to the bluff you mentioned. Micro stakes villains are usually on the honest side of things so it's best not to overthink these spots.

As played I like your line. While you're probably strong enough to call the flop raise, especially in position, on the turn you'll almost always behind.