This is an excellent example of a weird-fantasy location. It perfectly captures the Appendix N spirit by presenting a classic scenario: a seemingly idyllic place, the healing stream, which hides a deadly secret in the Orchid Oubliette. The writing is clean and evocative, giving the GM just enough information to bring the location to life without being overly prescriptive.
From a playability standpoint, the design is fantastic. The multiple points of entry encourage player agency from the outset. The central conflict is not just about combat, but about a meaningful choice: taking the powerful Staff of the Healer has the direct consequence of destroying the very healing stream the region depends on. This is a great, memorable dilemma.
The layout is clean and easy to parse, with all the necessary information readily available. The simple, hand-drawn art is also very effective and adds to the adventure's zine-like, old-school charm. An inspiring and highly usable adventure. Well done!