If we just recently started the process of buying a house, can the seller back out of the deal without any penalties?

Question Details:

We were to close on 14th of this month but because of appraisal issues, we have had to put the close on hold. The appraisal brought up a need to fix a garage, so we used our own money to buy supplies and fixed the garage in 2 days. The appraiser has failed to get his information in, so closing has been put on hold until he does. The seller is threatening to back out because closing has been delayed. Can he do this without any penalties? What happens to our earnest money, etc?

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