That looks like a cool tool! We are still updating Spritecraft, and in fact just updated today! Support for a lot of new block is in, although the block UI is getting a little out of control at this point.
Also you can change the axis by switch the "top view" or "side view" option in the Options menu. The "top view" option will lay it horizontally while the "side view" option will make it vertical.
New version can be downloaded here! https://www.autosaved.org/Spritecraft
(and I am the OP but they made me use my Twitch account to sign in so this is me now I guess)