I've uploaded a new beta version of UnSummoning: the Spectral Horde.
This version includes an incomplete but playable story mode, which lets you fight enemies through 6 levels, including swamps, graveyard, badlands, and a temple complex.
Other improvements include redesigned textures, making the game easier to play for people with colorblindness, numerous bug fixes, and free beer for everyone! (Actually, come to think of it, the free beer hasn't been implemented yet. Maybe in the next beta.)
As always, any and all feedback is welcome. Enjoy.