You can do several things.
If this is a project that you are building over time then you could start a developer's journal through which you can keep people updated about your progress and seek some feedback on your game as well post links.
You could ask for specific answers to specific problems in the right forum for example a question about artwork would be asked in the Visual arts forums.
Posting in the Your Announcements forum though is probably not the best place for your needs.
If you are seeking general feedback on the game itself...what tends to happen is you create a thread in the Game Design forum with the appropriate link providing some information about the game and requesting feedback.
Hope this helps