The control is simple and mechanics are interesting. There are lots of feedbacks on my actions too, making be aware of what's happening at all times. The health of the player is shown creatively.
I think that the colliders can be improved. The sprite of the spark is smaller than the grid but its collider is the same size as the grid. The player can sometimes slide through a corner of the wall (it actually made the game easier and more enjoyable for me).
Great job on the game!