If I am not mistaken, this might also be the first AGS game to feature achievements! Correct me if I am mistaken!
Playing the games now, concurrence is rather buggy (the platform edges in particular) but quite impressive so far. Also it needs a readme with all the controls and such. If you want to make it work a bit better, have the character stagger back once when against a cliff (when walking). This was used in Fade to Black to great effect so you could get as close as possible to an edge for a timed jump, etc. Also, making the collision area actually line up with the platforms is a good idea, since 90% of the time you'd fall off with a good 2 bodies wide worth of ground left beneath.
Essence: Pretty cool! I'd like to see this expanded so this event takes place some time later in the game, with the rest of the game having Commando or Ikari Warriors style control. The music in particular was very retro-delicious. My only issue with it is the controls could be more responsive and his vertical movement speed should match his horizontal with perhaps 8-way movement added for great justice. Very nice!
Lurking Horror: As a huge fan of Phantasm, I can't fault the story, though for some people it will seem pretty surreal and confusing in this condensed form. I'd really like you to officially slap on the Phantasm title and do an actual, faithful translation of it from the film. It would be awesome to see the balls of pain flying again.
City of Thieves: Pretty neat! The lockpick sequence is a bit fiddly because when it first starts it's easy for it to pop off and fail until you figure out what's going on, but the mechanics are good and it's a good framework for a larger game.
RunAway: It's difficult for me to say much about this as it feels like more of a framework for a game than a game right now. I'd like to see it after more time has been spent on an actual story and gameplay model.
15 Minutes: Simple, yet funny.
OSD 3D: Not sure what to say, really. The battle is rather confusing and one-sided, the '3d' effect isn't particularly functional or compelling. Basically I'm just not sure what's going on or if this is even a game.