Cool concept.
Not sure how but I managed to break the "It's locked" dialogue and it followed me to the main menu:
The guard got stuck on this door:
As a prototype, I though it was solid, not a ton to comment on right now but it could improve the way you interact with closed doors in particular.
Personally I'd set the first level at night to make it easier to sneak around, and you should probably wall off the building properly: you can walk a far distance away and from what I've seen there's nothing to do there beyond admiring the cute pixelart hills.
Sneaking games are fun so I hope to play more of this when it's got more content, I'll try actually finishing the demo when I have more time.
Editing:
No idea how I missed the "plug the USB" thing at the beginning, but after replaying through the level, it did not let me interact with the laptop, the "interact hint" thing at the bottom left appeared but nothing happened. Tried again with Evie and she can do it, tried once more with the (you) character and he couldn't.
I assume you should be able to vault windows but I could only do it once by jump crouching.
Is there a way to enter the laptop room without aggroing the guard? I managed to finish the demo with Evie by leading the guard outside and plugging the USB really quick