You can draw lasers / lines easily in Defold. You will need to place the laser/line segments in an atlas with edges extruded at 2.
Your segments need to have a width of 1. Then place their sprites on a .go so that their left side is at x of 0. This may require you to place them at x of 0.5 like in this example.
The important functions used in this example are dist2d to get the distances between two 2d points - this is used to determine how far to stretch the laser which is done through setting the x scale of the sprite's go, angle_of_vector_between_two_points which returns the radian angle between two 2d points, and vmath.quat_rotation_z which returns a quaternion of the rotation around the z axis based on the previously generated radian value.