http://www.pcgamer.com/try-the-demo-for-this-2d-platformer-about-defending-your-dungeon-from-adventurers/

Skelattack is not about the many brave adventurers plundering a dungeon's depths. It's about Skully, an enchanted skeleton who doesn't want adventurers poking around his dungeon. It's a fittingly spooky 2D platformer with an anti-hero twist, and you can try it for yourself via the free demo available on GameJolt. 

"You awaken to the sound of the alarm bell letting you know that intruders have been seen within the dungeon," publisher Ukuza says of Skelattack. "Joined by your helpful bat companion Imber and armed with magic, you exit into the sewers of the dungeon, sword in hand, to begin your hunt."