You can shoot with Ctrl-z
. Shooting depletes your blood meter, you can also cast another spell that trades some of your own health for more blood.
I agree that the inventory and item management needs work to be more comfortable as there is no easy way to see what slots an item would occupy. Using consumables is also very uncomfortable right now, you need to drop them on the ground to use them and you cannot pick them up again without consuming them.
Thank you again for kind and constructive comments!