I've made a couple updates in the last couple days and here are the changes. I didn't add the last one cause in the end, they are both quite close to each other, mostly bug fixing.
A detailed list of both patches is below:

· Fixed game breaking bug near elevator in lvl 9
· Fixed power up for controllers
· Fixed controller softlock when talking to the german soldier
· With that, changed keyboard prompts for dialogue choice
· Decent increase to graphics performace, at least ~15 FPS more on both maps
· Better AI for the white trooper enemies
· Better lightmaps for lvl 9
· Fixed lighting bugs in lvl 9
·  Moved some ammo from lvl 9 to more visible spots, and springled a bit more of ammo

Maybe a couple things still need to be enhanced, but for now I consider the demo more or less done. 
You can expect one or two more updates probably.

Cheers!