Personally I am fine if we post in our own topics, though, even in calc projects and ideas or even sub-forums, else it migth get rather cluttered fast if we have, for example, 5 projects discussions in the same topic.

Seems like a nice project, though

Also, no one is required to announce anything, you can still keep it secret if you want.  It will be to your advantage to not give too many details away so that the release brings some surprises and your entry is less likely to be cloned, especially if you have a unique idea.  But at the same time, it allows you to hype your projects, show off some cool screen shots and teasers, and makes it easier to ask others for help without breaking any rules.

You don't have to delete your post, there's nothing wrong with announcing it.  Its only if you feel that your project is at risk of being copied or having a story line that could be spoiled that I would recommended giving away less details.  Its nice to have at least a name or codename so at least people know what you're working on.  And by announcing your projects you can get other people's opinions and suggestions of what they like to improve your entry even more.

My idea, idk if it will be feasible, because I'm hearing that half-byte scrolling is hard X.X
I don't have any experience with Axe yet I don't have my calc atm, but I'll be getting them back within 2 weeks So I have no idea if I will be able to code this, but seeing Portal X, if I can learn like crazy over the summer, it might (just might) be possible

It will be a platformer game, where you are trying to get to the exit, and along the way, there are obstacles (kind of like Portal, Shift, and all other puzzle platformers)
I don't want the stage to be restricted to the screen size, so I want it to be scrollable both horizontally and vertically. There will be a user-friendly map editor that will save the map into either the program or appvar.
What's different is that there will be a timer in which you will be trying to get to the exit as fast as possible, and to make it more interesting, when you clear the level within certain time, you will be given points that you can spend on to buy items that will help to clear the other stages.
Some of the obstacles I have thought of are:
Spikes (basically, most of these kind of platformers have them).
rocks (or cubes) that can be pushed around, or destroyed.
keys and locks.
weak floors that will be destroyed once you walk over them.
And many others that I don't want to reveal just yet

I'm gonna try to work on sprites (don't know exactly what size it will be) before I actually start messing around with Axe.

Anyways, with the current Axe, will these be feasible? And are there any other contestants who are working on similar project? If there are, then it's not hard for me to change it since I haven't even started yet

Half byte smooth scrolling IS feasible with the intelligent use of subroutines.  Instead of reading the tiles using the simple single byte system {Y*width+X} you can read them with a subroutine that takes X and Y as input and then outputs the tile.  So it effectively becomes no more difficult than regular full byte smooth scrolling, you just have to add the additional subroutine.  You can even modify an existing smooth scrolling engine to become half byte compatible.  I wrote a subroutine you can use here.  The speed should not be very different than full byte when done correctly.  One speed optimization you can do is /2/2/2/2 instead of /16 if you do run into slowdowns.

wow, it's really hard to figure out the codes X.X I guess I need to play around with Axe before I tackle this

Ok I might have gotten that part. However I got issues getting the right stuff to display, it seems, now. I'll post in the other thread if I don,t figure it out