The game feels very well done with the simple mechanics. The movement controls is good, the assets all feel very well matched. The theme is well mixed together.
So only one thing would be good to improve is... to move the bottom text "Lure skeletons together..." or make it smaller.. cause i didn't know the bottom area was a place i could walk.
Also it would be nice to add more UHM! effects or sounds to give some sort of satisfying feeling.
but anyways. thumbs up for good job !