This was delightful! I liked the ambience and the assets, it really painted a vivid picture of what this could turn into. The idea of using a TV screen for a ritual instead of a painted mirror is also a cool story idea--makes me think about what other modern versions of old rituals I could envision, and how that translation might lead to unintended consequences.
You should be proud of what you made, especially given the context of the programming background. Feel free to reach out for help next game-jam, assuming you didn't already, I'm sure there'd be people willing to help fill in technical gaps if this is the sort of stuff you're pulling together!