I actually enjoyed the demo, the main character is oddly adorable for being basically a mannequin with happy eyes drawn on (guess it proves you can put big ol' eyes on anything and make it cute). I actually like the all-white world a lot because it reminds me of winter maps that people would make in old FPS games like Duke Nukem 3D that were basically just a white texture put on everything, so you get extra nostalgia points from me! However, some details that aren't white could definitely help highlight the whiteness of the environment even more. ;) Some simple ambience, like a basic wind sound, could also help sell the "hollowness" of the world.
The combat is very barebones and could definitely use some feedback like hit sounds and knockback, as it stands it kinda boils down to just walking up to enemies and mashing (or just ignoring them all and running past like I did). But the biggest issue with the demo by far is that falling off the ledge doesn't kill you, but rather leaves you falling into the void endlessly, forcing you to close the game and start from the beginning (as far as I could tell). It made the wall jumping section a bit annoying... at least until I figured out I could wall jump up a single wall endlessly and just walk on top. Either way, having a kill plane below the map would definitely help a ton.
Overall, a nice little prototype! I'm curious about the world and the main character. My theory is that we're playing inside someone's unfinished painting, due to everything being white and the character resembling one of those wooden art dolls used for posing.