Oh boy, it's difficult to list everything...
There's still about 20 Monstergirls who need a chibi sprite set, including BE sprites, and another maybe 30 who need a full portrait on top! There's various QoL and fixes left to implement, some mechanics need to be finalized, many cutscenes need to be made, new areas need to be designed, new rooms need to be made, dungeon design, more puzzles and secrets, the story needs to be fully finalized, more Shapes, more items, more tracks, special sequences need to be drawn and coded, optional quests, more menu NPCs, more NPC chibis, new blocks, player spells, enemy spells, unique skills, relics... I could probably go on, there's a lot to think about...!
Playable content wise, I estimate the current demo has maybe 20% of it, but I could be wrong. I'm hoping to release the next big demo (the BE update) in late 2026, though chance is also a factor because of Game Maker 2 related reasons. After that, it's essentially just adding new content for the full game. I definitely have a few years of work left...!