Just about any ticketing system (including the established open-source ones) could be described as an "alternative to JIRA", even if bare-bones, so you might be

Just about any ticketing system (including the established open-source ones) could be described as an "alternative to JIRA", even if bare-bones, so you might be better off describing the unique capabilities or UX that makes this one special. (And if mentioning JIRA at all, say what you offer to people converting -- $dayjob would probably be interested in one that seamlessly imports tickets with extra custom attributes and custom workflow which refers to them, but implementing that is not an easy lift.)