"Cheer up, dear friend, or they may come. And take you where the glum is from." Developer CosMind (Justin Leingang) teased gamers with that rhyme at last year's Independent Games Festival, providing little else to describe Glum Buster. He spent the past four years working on the action-adventure title in Game Maker during his spare time, but has for the most part kept quiet about its release.

CosMind contacted us last night, though, to tell us that he has released Glum Buster to PCs for free under a "charityware" scheme that will send money to the Starlight Children’s Foundation, an organization dedicated to "helping seriously ill children and their families cope with their pain, fear and isolation through entertainment, education and family activities."

I won't spoil too much of the game's charm, but Glum Buster features some unique environments and mechanics, and has you controlling a little guy in a raincoat, flying around the screen while using your mouse to shoot light at dark creatures. CosMind described his inspiration for the game in a recent interview with us:

Glum Buster was primarily inspired by the initial play mechanics of the prototype that I built. From there, bizarre as it may sound, it was continually inspired by itself. I was constantly fueled by the development of each component - be it play mechanics and dynamics, graphics, sound effects, functionality, etc.

As a result, inspiration begat inspiration. It was a pretty gratifying reciprocal process, really. Outside of that, the largest inspirations were my constant, thick-as-brick daydreams - I'm pretty much stuck in perpetual daydream - and good ol’ Mama Nature. The decision to make the game stemmed mainly from my desire to learn and work with a new tool set in my free time at home.

You can download the game from CosMind's Glum Buster site.