According to your email, at the moment you are a creditor of the developer for 60k.
If the developer asks you to complete, then they could enforce completion... in theory. But in practice, this becomes dificult if you don't have other assets in Spain.
If you have not been asked yet to complete (I mean if they have not formally notified you that the house is ready and you have to complete), then you may have a way out, but for this I would need to see the contract. There are many clauses in a contract that may be abusive or may draw a "way out" of having to complete a purchase that today, for whatever reason, is not of your interest.
Many contracts do not have a specific completion date, or do not include a description of the property, or do not include the consequences of not completing, or include a clause saying the sale is subject to the approval of a mortgage, etc. All these can be used to find a way out and ask for your money back, plus compensation and interest, if applicable..
Please feel free to contact us if you request more information.