The version on the Itch page doesn't have any platforms in the cave, so I thought I needed a torch but I couldn't find anything. In the downloaded version, you can see the platforms so I made it to the top and then got stuck on a screen after exiting. I can't exit to the left or the right and there isn't anything to interact with so I'm not sure if that's the end or a bug.
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This is very strange ! The platforms in the grotto should be invisible until you find and lit the torch. I can spoil where to find it if you want.
The game was made to play on browser, I didn't even know it was possible to play a downloadable version.
Thanks for the comments, I'll try to correct those bugs you mentioned.