I would like to ask if you guys have decided on wether or not your going to do an alpha test.
I personally think that you should amend the kickstarter beta backer into an alpha backer simply because many indie games of the same genre, such as gnomoria, towns, and minecraft all had a way to alpha test the game. This has led all of them to be better games in all honesty and it saves you guys money on having to pay for professional testers.
As long as you keep paying attention to what the alpha testers say about the builds(as you release them) then you will get very valuable feedback on how you guys are doing, plus it keeps people interested in the game.
That’s just my two cents anyway. Cheers!