A while ago I reached out to Nitrome about the possibility of gaining access to the other rooms shown in the Steam preview video. These had new entities and other technology that I hoped to test out and maybe include another category for. Here was their response:

"Hi,

We did have various other rooms made that didn’t make it into the demo including many that we didn’t even show in the video but as they were not connected to the map we had built you could not play them. Obviously there was an intention at the time that we were going to build a full game and the demo was intended to give a taste that we hoped at the time would get us access to put the game on Steam (which was a harder thing to do back then).

We are not able to make those rooms available I’m afraid. Too much time has passed and it would require too much effort to dig it out and make it so that they would be accessible to a non-programmer.

Don’t give up hope that we might go back to Flightless at some point though…we have been known to go back to old ideas. Flightless didn’t fit the model of mobile games we settled on making at the time but that’s no longer the case."