Half Life: Shepard my fan story game just the intro xD

I want these to happen if there will be a Half Life: Shepard game.

The intro of the game is that Shepard is still in the helicopter realm and he remembers the times that Gman always visited their headquarters and he is always talking to their superiors... and then suddenly, he heard the voices of the combine soldiers and something lighted up like a box and this is the vault that was used to imprison G-Man in Half Life: Alyx .. he heard the voices of the combine soldiers like this "it's him! capture him !" , "we need to capture him at any cost", they are capturing G-Man using the vault and those voices are heard by Shepard in the realm and he see a vague images of the combine soldiers capturing G-man .. and after they locked gman in the vault, there was a small crack or small portal appeared where Shepard was.. because of the G-man's captive , the force that keeping Shepard unable to move has been weakened and Shepard was freed and able to move again and then suddenly multiple portals comes out from every direction in the realm where Shepard is being freeze .. and Shepard was just staring at the small portal near him that came out and thought to approach it and he got absorbed by it and he blocked out ..( like what happened to Freeman when the Resonance cascade happened .. the screen blocked out and then teleported to xen). When Shepard woke up, he first saw the big xen crystal next to him .. and surrounded by people wearing tribal clothing as if they were worshiping or praying in front of the big xen crystal .. the small portal that Shepard entered was going or connected to the big Xen crystal that where it was prayed by the tribe .. Shepard was teleported to the continent that looks like Africa with tribe living in a big cave like a big city and the combine forces can't track them .. this tribe are praying together in front of the big xen crystal.. this tribe tamed the half life 1 aliens and the aliens became their helpers to survive.. just like the Bullsquids they made like horses because their legs are strong and because they also run quite fast and also the houndeyes they are like the dogs and alerting everyone if there's something suspicious entering their place or hideout.. and they also have vortigaunts with them who are also praying in front of the xen crystal.. and when they are all praying altogether, suddenly the big xen crystal lit up and Shepard come out or teleported in there .. they think that Shepard was sent to help them and this will be the adventure of Shepard xD .. (Sorry for my bad English xD)

The villains in this Half Life: Shepard game will be these people/monsters:

1. The rival tribe that lives in the forest or maybe in other places on this continent.. they have this kind of ceremony or ritual that they put tamed headcrabs on the head of their people to make them stronger and fast.. they call this ritual "The Bond" or "The Fusion" (hahaha sorry I can't think of a better name for this ritual xD) they are making zombie headcrabs but not actually zombie because the human are still 70% conscious because they tamed these special headcrabs .. after the successful bond of headcrab on the head of the human, the human now will gain abnormal amount of strength and speed that they can jump higher or run faster but their speech is not that clear like they have difficulty in breathing. (Africa continent chapter)

2. Half Life 1 and race X aliens upgraded and enslaved by the combine empire: Like the Gargantua .. they are now shooting lava and the combine modified it's appearance to make it look cool 😎 and also the race X aliens Pit Drone . It's now looks terrifying and run fast now and shoots spikes really fast and it has poison that you will lose your health every second

3. Upgraded Combine soldiers some of them now are using jetpacks with upgraded guns. These combines will appear in the Europe continent chapters

4. One of the high ranking combine advisor in the form of a human just like G-Man will visit Earth and he will be the final boss of the game .. Combine employers have been worried because Shepard excaped G-Mans stasis and they being paranoid that maybe Shepard will sabotage their plans (but they didn't know that G-Man planned this, maybe G-Man will betray the employers?) .. this advisor has a power like G-Man that he opens portals and send you there and he can summon soldiers just by opening door portals to fight you .