Copying the official announcement Andre made about this to confirm that this is legit:
If you missed the deadline for the following reasons:
- internet problem - forgot to associate do the jam page - any major issue
please e-mail mixandjamyt@gmail.com
PLEASE include the link for you game and the reason why there was a problem
The links sent in the next 30 minutes [since the jame ended] with the proper reason will be included