-a battle in the helicopter for the first level (take turns switching with Alyx with piloting an shooting, mostly shoot though)
-new synths. preferably the one's we've already seen like crab synths and mortar synths.
-return of at least one Xen creature (Houndeye! Possibilities: new ways the sound waves can effect you and give them good AI so they work great in packs)
-snow physics!!
-new zombie skins
-new rebel skins
-definately need to learn more about G-Man
-an awesome avalanche scene! (the houndeyes could play a part in this )
-new synths. preferably the one's we've already seen like crab synths and mortar synths.
-return of at least one Xen creature (Houndeye! Possibilities: new ways the sound waves can effect you and give them good AI so they work great in packs)
-snow physics!!
-new zombie skins
-new rebel skins
-definately need to learn more about G-Man
-an awesome avalanche scene! (the houndeyes could play a part in this )