>>285139858
You seem to be forgetting that Alyx takes place 5 years before HL2.

>Alyx's gun doesn't transform into an SMG at the end of the game

In the game we upgrade the pistol to have all those extra features in the period of about 12 hours. Alyx takes place roughly 5 years before HL2. Does it seem unlikely that she could upgrade it to its HL2 form in 5 years?

>Combine SMG's are different then AR2's and they use SMG's and Shotguns primarily in HL:A despite having future guns

Again, their weaponry seems more primitive at this stage, five years prior.

>we never see the alien combine again after this game

What alien combine?

>The citadel is FUCKHUGE instead of being very tall

A combination of it being in the process of being built, and creative liberties, I would guess.

>Nobody ever mentions Russel again
In this universe there's totally no way for a resistance member die, right?

>Alyx never mentions G-Man again
In the HL2 timeline, Alyx had never met him, and Eli still dies.