Science is the discipline of publicly testing ideas by systematic observation, controlled experiment and Bayesian inference. Notice there is no mention of "matter" in that definition.
If an idea has any consequences it can be tested by practicing the discipline of science. If an idea is consequence-free it is boring. Ideas about consciousness that are fully decoupled from material consequences are boring: they entail that no human action is caused by consciousness. For example, my consciousness would have to be unrelated to the contents of this message, because it was generated by making various bits of matter move.
Material consequences are the most studied by science because they are the easiest to get at and they have the widest scope, but we use them to study immaterial and abstract causes all the time.