That makes my character look up and down and hes being rotated. I just want him to look left and right.
If the mouse is on left side he should be mirrored and right side normal.
If you played Starbound, the same way.
Then simply change the character animation [or width to negative] depending on the x coordinates of your mouse and sprite.
mouse.x > sprite.x | sprite faces right [or set width to default width]
mouse.x < sprite.x | sprite faces left [or set width to negative default width]