Zed said:2d camera is a good choice.
The environment mockups look great.
Have you had any thoughts regarding the GUI? I'm asking because I'm a huge interface design nerd. Maybe you've written something about it that I've missed?
I haven't got into GUI yet. Right now I've settled on using CEGUI, but don't have a good UI designer yet so I'm just using default CEGUI templates.
I can probably do the GUI myself if I took the time, but right now the tech demo and editor have far higher priority. Sorry about that.