We launched earlier today on itch.io with Update #16 of our game, and it's available for immediate purchase: We Slay Monsters on Itch.io
A purchase on itch.io now will guarantee a Steam key when the game is through Greenlight, and all early access purchasers will also receive the game's soundtrack for free when we launch.
We Slay Monsters is an incomplete but fully playable game. Currently, one class is available for play (the Wizard) and the first set of monster unlocks is available (evil barnyard animals). We plan on doing regular updates during the early access period and launching the full game in the Fall of 2014.