Version 1.01 is an engine test, and therefore is not completable. However, it's still fun to mess around in it a little.
Before the game starts, it will prompt you to eliminate unneeded processing and enlarge your resolution if it isn't big enough. I highly recommend doing both or your experience might not be as enjoyable.
Space Bar: To remove the on-screen warning and to Jump.
Left/Right arrow keys: Move in the direction defined by the key pressed.
Down/Up Arrow keys: Make you look up or down. Don't really do anything.
Spacebar + Movement in ether direction: Roll.