You can try restarting Steam to see if SpaceChem shows up.
My own previous experience is that it can take some time for the games to show up in your Steam list. The fastest way is usually to restart Steam. Otherwise be patient, it will show up. The previous bundle had 3 games added post and they all showed up fairly quickly in the Steam list once activated.
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If you already bought Frozen Synapse, then follow this:
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Woo, SpaceChem :D I got it in the summer sale and haven't actually played it that long, but what I have played so far has been awesome!
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http://www.steamgifts.com/giveaway/zNxKy/spacechem
it has begun
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Be prepared for the next wave of attempts to bypass the ban on humble bundles.
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