It's now possible to add games purchased through the Humble Store or the Humble Voxatron Debut to your lexaloffle account.
This makes it a bit easier to update to new versions: you can view and download games from the Games > My Games page when you're logged in. If you don't have/want a BBS account, you can also use this page to request download links for any games that you own.
To activate games, just navigate to your Humble Store game page and click the large link at the top ("Click here to connect with your Lexaloffle account"). If you can't find a link the purchase page in your email, there is a key resender here.
EDIT: Humble Voxatron Debut customers need to follow a few more steps -- see predcon's comment below.
If you use a different email to log in to the BBS, edit your profile settings and set the "Alternative Email" to whatever you registered the game under.
Another reason to register is that in the future Voxatron will require users to log in to use online services (e.g. posting scores and content) in order to reduce cheating, spam and pirate-burnt bandwidth. This won't happen for a while, but it would be good to start getting users validated sooner rather than later.
Doesn't work for me.
I bought Voxatron through the Humble Voxatron Debut. I followed all the steps, including predcon's. When I click the activation link, it brings me ti a plage that says "Key not found", but shows the key right there and has a box below that lets me put in a key to redeem (which doesn't work either).
Could you please help me?
Hi I received a code for Voxatron to activate on this site instead of on Humble. When I followed the link in the email and entered the code I got a fatal error. Now when I follow the link theres no page :(
I recently messed up some of the redeem links. Try here instead: http://www.lexaloffle.com/api/redeem.php
Copy and paste everything to the right of "key=" if you received a direct link rather than just the key. Let me know if you still have trouble: joseph [at] lexaloffle [dot] com
It would appear that the Humble Mozilla Bundle doesn't have a link for Lexaloffle on their "My Games" page.  At this point, we cannot add our Vox purchased there to our account here.  Please look into this for us. :)  Thanks!
BTW, I bought the bundle based on the Google Search Page freebie Vox.  Good stuff!