If it's a bug, do you at least partially take responsibility and are offering a partial refund?
I take responsibility to fix any bugs as soon as possible. However it is impossible to tell whether the private key was actually lost or even in the wallet in the first place so we do not offer any refunds (The exception being issues shared send which is server side). If it was indeed an issue with the app then I do apologise but any coins hosted with blockchain are your own and you should always keep your own backups etc. The new version of the app allows you make backups to external storage much easier.
And regarding problem with shared send, what about other users who are missing money?
They should PM me.