How do I make the sprite move after touch position?

Hello

I am trying to create a shooter game, in witch the player sprite is controlled by touch position.

Basically when the user touches the screen the sprite should follow the finger movement. When the touch starts the sprite should stay where it is not move towards the position. It should start to move only after the finger starts to move.

This is what I did and the basic mechanics works but with a lot of bugs.

mediafire.com/file/6coygpknipbd02l/touch_controls.c3p/file

Can you guys help me with this one.

Thanks in advance