Assets

Unit Assets

Asset Source
Skull http://shop.bitgem3d.com/products/low-poly-micro-skeleton-tom
Mummy http://shop.bitgem3d.com/products/low-poly-micro-mummy-taal
Ghoul (Zombie) http://shop.bitgem3d.com/products/low-poly-micro-zombie-brian
Ghost http://shop.bitgem3d.com/products/low-poly-micro-ghost-hubert
All-in-one http://shop.bitgem3d.com/products/micro-mega-pack

Free, Open Source

Pending.

Note: Essential gameplay can be achieved using only 1 base Skull with 4 variations

Level Assets

Proprietary

Asset Source
Low Poly Pixel Dungeon http://shop.bitgem3d.com/products/low-poly-3d-pixel-dungeon-set
Low Poly Dungeon Deco Set http://shop.bitgem3d.com/products/low-poly-3d-pixel-dungeon-deco-set

Note: Alternative style.

Free, Open Source

Pending.

Power Assets

Proprietary

N/A

Free, Open Source

Asset Source
Bomb ...
Poison ...
Gas ...
Curse ...
Blockade ...
Switch-to-Ghoul ...
Switch-to-Mummy ...
Ghost ...

Icons

Proprietary

Asset Source
Fantasy Spell Icons http://graphicriver.net/item/85-rpg-fantasy-spells-icons/4985376

Free, Open Source

Asset Source
Game Icons http://game-icons.net/

Sounds

Pending.