Some things I am looking at doing is implementing multiplayer (bluetooth and online play), single player, coop mode, and so on. I'd also like to make use of the accelerometer in the phone (specifically the Omnia). The game is a 2D Game accelerated by Direct3D, supports network player up to 150-200 players (right now this is buggy but works). Of course we're very early alpha, and development tools are no very far. The game is free (ads on the website, that's it) for now. Donations will be accepted for it.
For movement, I was thinking of having the ability to use the accelerometer to walk forward, backup, etc. Since it's top-down (like Zelda LTTP), it would probably work pretty well with an accelerometer on a phone.
What about multiplayer? I never seen a multiplayer game on a phone, of course displaying 200-300 players on a cell phone wouldn't be feasible at all so it would half to be limited to say 20 people at a time. I know my data rate for my Omnia is about 40-90KBps down and up, which isn't bad at ALL. I would LOVE to be able to allow cell phone users to play with the PC users (and of course be immune to certain functions that PC users can do but phones can't). It would be cool to hop on chat with your friends, and so on through your phone while sitting at a airport or stuck at the in laws house.... And of course this would have to have a unlimited data plan.
I would probably have to scale the game back graphically. It's not TOO intense, and does feel similar to LTTP (and no it is not a clone).
Another idea I had was allow your cell phone to link (bluetooth OR network) to your PC, and use it to control the game (like DS-Wii/GC)... not sure if this would be worth it or what?
The MOST important thing is allowing this cell phone version to support loading levels from the PC version. I know it'd have to have some kind of modification, but this would prevent us from not having to recreate our tools. A different file saving format would be perfectly fine of course. My only problem right now is processing Lua...
Any opinions or ideas let me know =)