Thanks for the feedback everyone!
Regarding controls, I'm not sure how you've set them up. If you're trying to emulate Magic Carpet, think of a hoverboard. Controls would be your standard FPS WASD (front, back, sidestep) with mouse aiming, just making the player have little friction, and maybe making the JUMP/CROUCH buttons modify height.
Yeah, this sounds very similar to how I did it (except no friction yet).
Linux build runs on my system, but there was a bug. I have a wide screen (1024x600), ...
Runs cool for me on Kubuntu 64-bit, though at an ugly low resolution.
Linux build runs by default in 1024x768, the only way to change it, at the moment, is via command line, like "OnTheWing -screen-width 1024 -screen-height 600" (in Windows there is a launcher for that).
Cool little demo you've put together. with the recent build I found the controls to be pretty unwieldy; mostly because I couldn't revert the vertical mouse movements in the menu options, didn't seem to work.
Strange that menu options don't work, are you sure you didn't try to change "Controller / Reverse Vertical Look" (this option is for gamepads only) instead of "Reverse Mouse"? In any case, I indeed should make "Reverse Mouse" off by default.

I can't remember how it was in the original, but in this I found the controls a little annoying - mainly because it's very difficult to come to a complete stop. Some small amount of friction in the movement would not go amiss, I think.
You can stop completely by pressing the Left Alt button, but adding some friction should be helpful anyway I think, I'll give it a try.