my bad – (AmE) used to admit that something is your fault
so far so good – successful up to this point
(that’s) too bad – there are two meanings: you can use it either to say that you feel sympathy about a problem, or that you do not care. It depends on what is being said and the way you say it.
not bad – quite good and better than you expected
that’s a good one – used to tell someone that you do not believe something they have said, or think it is a joke or a trick
bad luck – used to express sympathy with someone when something bad has happened to them
be good to go – be ready to do something
good for you – used to show approval for someone's success or good luck