Everybody needs to stop complaining. So, you lost the ability to save designs and levels for a couple days. The fact that you are this annoyed at this tiny inconvenience is kinda pathetic. And really, complaining that you paid $10 for a buggy game? $10 for this game is a steal, and, although this game has had bugs before, it doesn't happen very often.
Bottom line, shut up and wait for them to fix it.