Given some information from chat and a quick peek at a guide, it seems like we don't have much at all left in Crystal Project. Technically, we could head back to the castle and wrap things up. But there's still some exploration to do and crystals to nab.
... And no, I'm not going for the Golden Quintar.
It's time to get snug in a mug with Crystal Project!
∞🐍∞
The map is near full.
Just nooks and crannies remain,
Hiding their secrets.