Castruccio raised a few valid points. My perception is that Soldak games are solid enough that you can early access at a beta stage and generally receive positive feedback. I am a little more concerned about an alpha having an increased risk of poor word of mouth, or early negative feedback ratings on Steam. Only you can judge where that line is for what 'alpha' means with Soldak, though, Shadow.
To be honest, the scope of the Hardcore game is not what I am personally looking for - I prefer the larger scale of some of the prior games, like inclusion of town/clan management and diplomacy with the NPC teams. However, I do want Soldak to continue to do well so it is able to go on to make Zombasite DLC #2, or the next iteration of Din's Curse/Depths of Peril/Zombasite. So, best wishes.