Thanks for the questions :)
The email had a 'replyto' email (my email) which you would have been able to reply to (I got plenty of replies so I know it works) - it shouldn't be ending up in spam filters, but that would vary by the email service you use and whether they view emails from itchio as spam.
You make a good point about the bundles - and we also underestimated the work it would take to put it together. Some people would find it easier downloading it all at once, but you're right that it makes it harder to find the place to give feedback. We're definitely rethinking how/if we'll do a bundle next time.
The bundle's credits file was only for the games that are in the bundle. People can still see the jam page for the full list of submitted games (and their associated creators).
Still planning to at least get some let's players on board now that the bundle is done, although as with any big jam, there isn't any guarantee that all entries will be played.
Feel free to send me an email if you have any further questions! (I'll also let you claim a prize since you went to the effort of making this post)