Thanks for your feedback.
Yes, the main story is not futa, but you need to collect enough Red Shards to unlock new places. When you collect one, it will show a “corrupted” animation related to the world, usually darker and non-vanilla. These scenes include devilish angels, werewolves (furry), futa, and others.
The idea behind the Red Shards is to keep them a mystery and a surprise when you find them, so nothing is spoiled beforehand.
Most players are fine with this, but I may consider adding an option at the start of the game to turn certain fetishes on or off, allowing players to customize their experience. I’ve seen other games do this for things like golden shower or bestiality, for example.