hey Oliver, if you manage to do that, I'll be requesting tons of help from you =P
I'll be developing adventure games later on, when I really get the grasp of the whole engine.
If you haven't, please check Fester Mudd Ep. 1. It's FANTASTIC. It's a true successor of Lucasarts games.
What I feel it will be hard in Construct, is the movement. I'm really worried about how Construct might hand the collisions, that's a place where AGS is actually quite solid, it seems.
I've seen your demo and the sprite scalation is worrysome too. It's not like old Lucas games.