godot move and slide not working
1) You should not be using move_and_slide in _process(). Use _physics_process().
2) move_and_slide() uses pixels per second, so you should not multiply by delta
Per the docs for KinematicBody2D:
linearvelocity is a value in pixels per second. Unlike in for example moveand_collide, you should not multiply it with delta — this is done by the method.