Really cool! I loved the moments I could reanimate lots of skeletons, it had a really nice punch to it. Only thing I would say is the energy meter could be a bit more consequential, mine barely emptied.
I had added a hidden mechanic where if you have too many skeletons, your energy meter is increased by summoning new skeletons. Also every death feeds you back for %20 of your bar, making moments where you kill many enemies fast looks like your bar is always full.
