I’ve played as well other (good) games that used only a Halloween theme while it was not the goal.
You are so right about that.
The desktop builds look as expected. May be due to Godot using a less powerful engine on web builds
Yah, Godot is wonky sometimes. I usually make sure everything works and looks as intend on the web build first. Then check the other builds. Most players tend to avoid downloads when possible.