Ok so it's way too dark and just like the other comments said, the textures are black so no light bounces off of them. There should've been more tutorials cause I died trying to use the acid. No sounds takes away a lot from the experience, you should've added footsteps, especially because there is a weird sound coming from the alter, meaning you must be having some sort of sound manager.
Overall, it does have potential I hope you build on it after the jam ends :)