I just tried it but unfortunately it doesn't recognize my keyboard layout and I can't use the usual shortcut to switch to a qwerty layout. Even changing the layout before starting the exe doesn't work. There is a wiki article about using scancodes to have layout independent keyboard inputs (on Windows)
The behavior of the application is weird: after alt-tabing, clicking in the window, doesn't give the focus to the game. Or at least it's not consistent. And when it gives the focus to the game, it keeps shooting until I left click again. When it doesn't give the focus, it still hides the cursor, even when it outside the game window. Also when the application doesn't have the focus I would prefer it doesn't hides the cursor at all.
Just turning left/right with the mouse, the view "shakes". Here is a video
(although it's not that obvious in the video).
I know it's a demo but it would help to be able to configure the mouse sensitivity and be able to go fullscreen, or at least maximize the window.
I'm confused about the sphere. At first I though it was the player model (in a 3rd person) but it seems to be the weapon in an fps. But it's weird because it looks like the camera is rotating around it and it also looks like it's moving with the camera. If it's a weapon, it should be fixed in the view (a view model).
Holding down jump restart the jump sound in a loop.
And the movement speed (for the small time I manage to move) should be faster.
Apart from those things it looks great, it doesn't feel any different than a hardware renderer.