Holy moly, that is a map if I've ever seen one! My jaw was on the floor after continuously going through rooms and thinking "yep, that's the end of the map" only to be greeted by MORE map. Very impressive.
Like Roldy said, the map menu is really nice. I have no idea if the "I'm stuck!" button that boots you out to the desktop is the final, intended purpose (I was expecting it to be some sort of hint feature), but I was laughing hysterically at it anyways.
As in the prototype, there seem to be some quirks of the player SM and the world that results in weird things like grabbing onto the side of ledges in thin air, etc. I also would highly recommend disabling autoclimbing on walls once you are in complete freefall, as it's disorienting when I am falling down to get to a lower area and I climb on a ledge without meaning to do so.
Very annoyingly, I got a wrong-warp glitch where I went through a door and I ended up in a completely different area, and the camera got desync'd into another area too when I tried to go back, forcing me to reset.
For combat, I think that the player being given some extra attacks that conserve momentum would benefit the flow greatly, esp. a dash attack or slide attack.