In the exploration I linked, the only types of interaction offered to the learner were either ok/proceed, or 'answer this textual multiple choice question'. This may make it seem like Oppia doesn't do much more than software for interactive fiction.

BUT Oppia has lots of other interaction types: https://github.com/oppia/oppia/tree/develop/extensions/inter...

For example, you can input music notes: https://github.com/oppia/oppia/issues/4842

Or ask the learner to enter a fraction, or to sort some objects.