Thanks! Yes you're right, I wanted to keep things a bit "hand wavy" for you to explore and find out. I planned out an entire second forest level, as well as ways to make the pacing easier and more guard rails around the first cave level teaching you the different hand and shadow mechanics. So I might still do that and improve the first level, as well as the second level.
Theres a bug in the newest chrome for mac, which made me lose one day during the jam, and also means the shadow detection isnt as good (I'm using a bunch of raycasts shooting from the spotlight instead of some viewports and shaders to calculate areas in shadow).
Did you check the youtube walkthrough video? Would be curious to hear more what you would improve to make this more clear?