I find mythology pretty interesting, and Norse is one of the more popular ones.
Items
I trust you understand the implications of what you are suggesting. I do not know how exactly you plan on using the items, but if you just have it as a vague idea, consider altering it so it is more streamlined. Six items max with differing carrying capacity costs has the potential to be a huge pain to implement, not to mention get working properly (and having it also be meaningful). Writing a good story will usually trump scripting, or even highly branching narratives, but it all does really depend on what sort of thing you are going for. Think about why you are using the items, being deliberate can help make sure you are making the best experience you can.
Game or Story
Mixing the two is possible, but usually focusing more on one aspect can make it easier to make the thing, while also giving it a more solid identity. So far it sounds like what you are going for is a more game focused storygame, what with the items and the combat system. However that might just be because you haven't mentioned plot/story based stuff yet.
Combat System
Honestly, be vary of combat systems, hard to pull of in this system, but do go for it. Can be a good learning experience, but know it isn't really something easy to do. Be careful with the stances, balancing is a pain, and in simple systems, it is hard to not just have one 'best' option, which sort of defeats the point of having options in the first place.
Norse Mythology
Are you just using this as cheap window dressing? I'm just curious, since there is many ways to go about using it, and it is possible to go very in depth. When directly using outside sources, I'd advise being very aware of it, since it can be easy to slip into a crappy implementation of it. Also keep in mind that not everyone will know about Norse mythology, but also that some people will know more than you (probably). Just don't expect Norse mythology to make it better all on it's own, the impact it has will still depend on your work.
Conclusion
Way too early to tell, but so far I am worried about the state of this project. It certainly can work, just when people mention items, a combat system, and nine worlds, I get worried. I definitely do encourage you to work on it, as that is really the ultimate determiner of if it'll work, and discouraging people is far from my goal. I will mention that the implication of your posts that there will be more updates is definitely a big plus, so I'll eagerly await future notification.
TL;DR Be careful, you thread on dangerous grounds. Do keep threading tho, I wish you success and hope to see more updates. Items and combat systems are also tricky things.
P.S. I hate what you done with Bifröst. Dark grey background, each letter a different colour. I can harbour complex guesses as to why you done it, along with simpler guesses, but I won't. Instead I'll just say that it is hard to read, and so ask you to look at it for a minute or two, then tell me if you'll do it again or not (but jokes aside, I'd be careful modifying text so drastically, the dot points and bolding of the post were nice tho, same for the paragraphs and brackets).
P.P.S. Using an image might have been better if you wanted an oomph, figured I'd mention it.