Arrow keys or WASD to move
Arrow Keys to move the menu around to get to the arrows and the map
Click to fire
R to Restart
Click on the quiver to show an arrow, then click accept or decline to add the arrow to your inventory or not.
The greyed-out arrows on the side show if they are in your inventory or not and also can be clicked on to remove the arrow from your list.
'Bugs'
There is a jump that you cannot make, it's possible because double-jumping is enabled.
G is still the cheat.