I agree turrets are very fast and shoot too quickly when they see you. Once you collect the staff clicking the world should always shoot, took me a while to figure out how to combat the turrets. Maybe add a little "prepare to shoot" animation to let the player know in advance when the turret is about to shoot, and maybe let them reload after 5 shots?
Pressing the numbers should be reserved for potion use.
Can be a neat little game if you put in some more patrolling enemies and stuff^^