Alright, I know this is just an early demo but I'm gonna list the issues I've seen with it so far while avoiding stuff people have mentioned already.
-The enemy can push you into the box debris things and softlock you there after you break out of their scene. This is really easy to make happen.
-The collision for the box things isn't perfect and you can find places to walk through them by just pressing up against them.
-If you get up against corners of the map or in doorways you can see through the map's geometry.
By the way, I'm liking how this is coming along. I know making a game is hell and it won't look like much for several months, but I think with some perseverance you could actually make something interesting here.