The Dink Network

The game is fully finished and playable up until you hit the desert area, with the exception of an optional dungeon puzzle I never made and an additional mini side-quest I never managed to fix and instead was just completely removed. Once you make it into the desert area, there is one fully playable side quest you can complete and you can explore that initial open area but there isn't much else to do there for now. The north bridge that leads into the first major desert town is blocked off because everything beyond that point is unfinished.

All I will add is that all of the initial area's content is unlocked by the time you help out the town of Faiori, so if you feel like you missed something make sure to check each of the three towns before heading off into the main dungeon.