The deal has been sweetened. In any sense of the phrase.
In case you don't already know, the Humble Frozen Synapse Bundle is currently letting us pay what we want for Frozen Synapse. This is already a bargain considering that it's one of the best games of 2011 (and garnered a 10/10 score in our full review), but you'll also receive a host of fantastic extra free games if you pay over the $4.75 asking price. SpaceChem, the addictive nuclear reactor puzzler, has now been added to the extra pot - making this a deal that simply shouldn't be missed.
If you've already paid over $4.75, a download link and/or Steam key will have already appeared on your Humble Bundle download page. Check out Matt's original deal post for more details - while there's still time!