First add paths, going left, right, up and down. Then, for example, when you press keydown right, add change path of bullet, path towards right. Also add path finish so the bullet wont loop on path.
Hey I had the same problem with the bullets, but the tips these here are written don't work
Because when I press down left the bullet fly to the left...this is ok...
but when I press down right the bullet change the path by flying!?!??!