Looks good and plays pretty well. 'Levitating' bones is a bit wonky, besides the wonkiness that physics stuff tends to introduce it feels like the bones get dropped alot even when the necromancy has mana.
Unless you are planning to use it for something else I would appreciate jump on spacebar in addition to up direction.
Decent puzzles from the handful of mechanics with potential for sure.
Didn't see any serious bugs. Played on HTML5.