Vahn, an Oligmorphemic Language
Vahn /væn/ is an oligomorpheic language built of around 37 morphemes. It has been heralded a number of times on the /r/conlangs subreddit and it's associated communities as “the good oligomorphemic language”. Ultimately however, it remains extremely poorly documented, with the best documentation coming in the form of a document I made in MS Paint when I was still actively working on the language. It was successfully taught to one other person to a high standard, and a few to a lesser standard, and thus I believe it to meet the minimum requirement for being successful when it comes to oligomorphemics.