The sprite is a person, so no, can't be turning at all, has to be upright. Would I just remove the angle part of the code? Say the Sprite's angle is 180 degrees, that has to stay the same and can't change, sorry.
Imagine a person walking at a constant speed. Going from 0 and when the player moves the joystick, the sprite goes from 0 to max speed instantly, and when they release the joystick, the sprite stops, no slowing down.