Firstly, excellent game/interactive story, any bugs or problems or whatever vastly overshadowed by how damn cool it is. And then I am going to get right to the nitty gritty. Some of the corrupted memories do not change to smiles after I combine, does that mean I used the 'wrong' object and got a complete but still corrupted memory? Navigation from each memory using the arrows is awful, I have no idea which goes where and find my only recourse is to use the map (which works quite nicely). Although once you know where an arrow goes you can use it, but the map is always easier. Perhaps hovering over an arrow could show you where it will take you?
One thing that ends up working kind of badly (and what knocked you from 5 to 4.5 is the zoom. Some of the interactive portions barely show up on the zoomed screen and I almost missed some things (maybe I did miss some things). It would be nice if while zoomed you could move rather than simply panning around. It feels like it makes it very difficult to see everything..
The ending, I'm going to try to discuss without spoilers here, kind of shocked me and wasn't at all where I saw the story going. As a result of that and the 'completed' memories which still show as corrupted I have to wonder is there more to the game? Is there another ending which is more.. definitive? After completing the game it didn't seem like I had any option to go back and change any of my interpretations/insights.. Is there more? Perhaps some little thing that I missed on a zoom in?
All that being said I was wrapt in the game from the start. I found the method of interacting and learning about the character as he learns about himself to be intriguing to say the least. I had made some assumptions about certain things as the game progressed which seemed to be incorrect based upon the ending that I received. That ending however left me wanting to know more (which is presumably the goal of a demo). As it is a demo and not a full game, perhaps my suspicion of alternate paths is incorrect. If it is, consider that perhaps it shouldn't be. You are starting with corrupted memory files which you attempt to piece together into you based upon things you find in those memories. Perhaps you come to the correct conclusions, perhaps you don't. And were that to be the case, perhaps consider allowing one to go back and re-evaluate a memory (combine a different object). The strange places this could go simply delights the brain. I keep wanting to to tick you up that last half a star, but the game really does have some places that could be improved.
On those lines I just thought of something else that would be great to have. Rather than (or perhaps in addition to) allowing us to re-view notes and insights perhaps a journal of some sort where it was all compiled as we learned it. Also, now that I mention it, perhaps some more detail on why this practice of resets exists would be useful, though it may end up rather cumbersome in the game itself, but perhaps not if it is something provided piecemeal through the game.