Artwork was dazzling, I'll get that out of the way first. Animations were tweened, so they look not as organic as they could be, but the rest was fascinating. I congratulate you for creating a dynamic and fun world. It takes lots of skill and talent to make something engaging for the player.
Music was great as well, I don't know why the scores are so low though, many of those tracks are wonderful, done by the amazing Cazok... I even used the Canthos theme for my own game, hope it doesn't inflict anything on this, but it sounded so cool.
Gameplay is where there are a few issues. I won't rate you on it too much because it is obviously still in demo form, glitches are expected. Here are the glitches I encountered.
-Grappling is extremely glitchy, sometimes I was thrown around an entire object and other times I instantly died or was able to climb into infinite space.
-Combat is a bit dull with the main characters, you should add combo moves.
-When you roll under something and try jumping it messes up. I actually have a solution for this, for as I have the same kind of mechanic in my game and I used a method to fix it.
Go to your character code. Make a variable around the jumping actions,
Then, go to a part where you have to roll. Make an invisible movieclip box on that area and make hittests that disable the jumping variable when your player is touching them, but make an
command so that jumping is enabled once you out of the whole.
Anyway, onto the rest of the glitches.
-Menu should be mapped to P and arrow key navigation is recommended.
-If there was a ceiling that was walkable and i was underneath it, if I jumped, I hit it and then boosted up, looks a bit jaggy.
-Grappling to walking lines should be automatic instead of pressing CTRL, or at least have a command pop up over the characters head that says CTRL so it is more obvious.
Most of the glitches are found in the grappling move, though. Unless it's too late, I suggest scrapping it or taking away it's functionality of gripping to walls because it will be really hard to make it glitch free. Critics notice tiny little errors like this and go mad.
Otherwise, really cool project and I am behind it 100%!