That wouldn't happen since Blockland uses DRM.
Does Blockland's method really count as DRM?
It uses an authentication key, yeah, but it doesn't limit your use of it.
It prevents piracy, in that you can't use the game without purchase (which HumbleIndieBundle users would do), and it stops multiple people using the same code at the same time.
You can still use it on multiple machines and without being online. And you can use it around a friends house and let a friend play on it, although you shouldn't give away your code.
I don't really know what's counted in the broad scope of DRM, nor the rules that Humble Indie Bundle uses, but I don't think Blockland would quite count as something that's not in the spirit of other HIB games.