wow! I think this is a great 3D game. It's obviously short but you still have plenty of days to add more levels. (I shouldn't be the one to talk xD)
I particularly like how the controls feel, and how easy it is to move in the world.
Btw, Is the name a play on something? It reminds me of a song called "Back At One" (google it if you want).
As for improvements, I'd say the instructions are not 100% clear and I do not know what "Controlles" means. I'd try to rephrase your text or make clearer.
And as usual, you can always add more levels :D