1. I think there might be a bug there then (aside from the lack of a tutorial), because I tried everything I could think of to use the Ribbon. I didn't see an inventory of any kind, except the character menu, and I clicked all the "+" buttons there, assuming they were gear slots or something like that, but none of them showed an inventory or the ribbon.
2. Oh, I think I miswrote in my original post here. I think this was after the second crystal, or whichever one introduced the RMB alternative attack, which had the entrance to the next section in the bottom-right. I don't think a cutscene is necessary, but maybe just a different zoom level instead, and/or better handling of aspect ratios (so taller ones like 16:10 show more instead of less).
I'm so excited to play more! It's easy to be a fan of such a well-made game. The technology you've already employed is excellent. For example, the way the character can be seen through walls is just perfect. The charge-up mechanics and cooldowns are awesome too.