You can try the demo version first, https://eccma417.itch.io/lonarpg-demo, the demo has a lot of content and a canon ending.
The only location not accessible in the demo is Sybaris, located at the far north of the map. Sybaris has a DOOM theme biome, and its designed for hardcore players who don't mind getting one or two-shotted by OP creatures there.
Try the demo first before making a purchase decision.